HiSPI控制器添加debugfs的支持并且修复debugfs name

本次提交了两个patch。一个是使用debugfs_regset32接口创建寄存器转储文件，自动创建通用debugfs文件写读回调函数。另一个是修复debugfs目录名称不正确，把hisi_spi65535改为hisi_spi0。

环境：FPGA
步骤：
1. 加载spi-hisi-kunpeng.ko
2. cd /sys/kernel/debug/
3. ls 查看debugfs目录是否注册，名称是否正确

验证日志【log】:
estuary:/$                                                                      
estuary:/$ uname -a                                                             
Linux (none) 5.10.0+ #1 SMP Mon Feb 21 17:06:36 CST 2022 aarch64 GNU/Linux      
estuary:/$                                                                      
estuary:/$                                                                      
estuary:/$ ls /boot/efi/EFI                                                     
ls: /boot/efi/EFI: No such file or directory                                    
estuary:/$                                                                      
estuary:/$                                                                      
estuary:/$                                                                      
estuary:/$ cd /lib/modules/5.10.0+/kernel/drivers/spi/                          
estuary:/lib/modules/5.10.0+/kernel/drivers/spi$                                
estuary:/lib/modules/5.10.0+/kernel/drivers/spi$                                
estuary:/lib/modules/5.10.0+/kernel/drivers/spi$                                
estuary:/lib/modules/5.10.0+/kernel/drivers/spi$ ls                             
spi-cadence.ko        spi-hisi-kunpeng.ko   spi-pl022.ko                        
spi-dw-pci.ko         spi-hisi-sfc-v3xx.ko  spi-xlp.ko                          
estuary:/lib/modules/5.10.0+/kernel/drivers/spi$                                
estuary:/lib/modules/5.10.0+/kernel/drivers/spi$                                
estuary:/lib/modules/5.10.0+/kernel/drivers/spi$                                
</kernel/drivers/spi$ insmod spi-hisi-kunpeng.ko                                
[ 3848.386896][  T295] hisi-kunpeng-spi HISI03E1:00: hw version:0x30 max-freq:12
500 kHz                                                                         
estuary:/lib/modules/5.10.0+/kernel/drivers/spi$                                
estuary:/lib/modules/5.10.0+/kernel/drivers/spi$                                
estuary:/lib/modules/5.10.0+/kernel/drivers/spi$                                
estuary:/lib/modules/5.10.0+/kernel/drivers/spi$                                
<.10.0+/kernel/drivers/spi$ cd /sys/kernel/debug/                               
estuary:/sys/kernel/debug$                                                      
estuary:/sys/kernel/debug$                                                      
estuary:/sys/kernel/debug$                                                      
estuary:/sys/kernel/debug$ ls                                                   
acpi                extfrag             regmap                                  
bdi                 fault_around_bytes  regulator                               
block               frontswap           sched_debug                             
cleancache          gpio                sched_features                          
clear_warn_once     hid                 sleep_time                              
clk                 hisi_spi0           split_huge_pages                        
debug_enabled       kprobes             suspend_stats                           
device_component    kvm                 swiotlb                                 
devices_deferred    megaraid_sas        tracing                                 
dma_buf             memblock            usb                                     
dma_pools           mpt3sas             wakeup_sources                          
dmaengine           pinctrl             zsmalloc                                
dri                 pm_genpd            zswap                                   
dynamic_debug       pwm                                                         
error_injection     ras                                                         
estuary:/sys/kernel/debug$                                                      
estuary:/sys/kernel/debug$                                                      
estuary:/sys/kernel/debug$ lsmod                                                
spi_hisi_kunpeng 16384 0 - Live 0xffffab30527a6000                              
vfio_iommu_type1 53248 0 - Live 0xffffab3052798000                              
vfio_pci 86016 0 - Live 0xffffab305276d000 (E)                                  
vfio_virqfd 20480 1 vfio_pci, Live 0xffffab3052767000 (E)                       
vfio 40960 2 vfio_iommu_type1,vfio_pci, Live 0xffffab305275c000 (E)             
sch_fq_codel 24576 1 - Live 0xffffab3052755000                                  
aes_neon_bs 28672 0 - Live 0xffffab3052790000                                   
aes_neon_blk 32768 1 aes_neon_bs, Live 0xffffab3052783000                       
aes_ce_blk 36864 0 - Live 0xffffab305274b000                                    
aes_ce_cipher 20480 1 aes_ce_blk, Live 0xffffab3052745000                       
crypto_simd 24576 3 aes_neon_bs,aes_neon_blk,aes_ce_blk, Live 0xffffab305273e000
cryptd 24576 1 crypto_simd, Live 0xffffab3052737000                             
[ 4235.536054][    C0] random: fast init done                                   
estuary:/sys/kernel/debug$                                                      
estuary:/sys/kernel/debug$

验证结果：能查看到debugfs已注册，注册的名称为hisi_spi0。

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