[OLK-6.6] rnp驱动出现warnning告警

**一、缺陷信息**
特定config情况下使用clang，打开W=1时，rnp报warnings
**内核信息：**
OLK-6.6
tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
**缺陷归属组件：**
NET

**缺陷归属的版本：**
head:   97ba28f60ba0c12d39b4d3032121317ffebc06ba

**缺陷简述：**
driver/net/ethernet/mucse/rnp
中代码出现部分报警信息
**【环境信息】**
硬件信息
不涉及
软件信息
tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   97ba28f60ba0c12d39b4d3032121317ffebc06ba
commit: 455d45ae080810ae554f5e586adb9004230f9f70 [3862/3876] drivers: initial support for rnp drivers from Mucse Technology

网络信息
- 不涉及

**【问题复现步骤】**
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20240308/202403080243.ondrgrmr-lkp@intel.com/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project 79ba323bdd0843275019e16b6e9b35133677c514)
reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        git remote add openeuler https://gitee.com/openeuler/kernel.git
        git fetch --no-tags openeuler OLK-6.6
        git checkout 455d45ae080810ae554f5e586adb9004230f9f70
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-19 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/net/ethernet/mucse/rnp/
**【实际结果】**
All warnings (new ones prefixed by >>):
skip........
>> drivers/net/ethernet/mucse/rnp/rnp_mbx_fw.c:1456:5: warning: no previous prototype for function 'rnp_mbx_lldp_all_ports_enable' [-Wmissing-prototypes]
    1456 | int rnp_mbx_lldp_all_ports_enable(struct rnp_hw *hw, bool enable)
         |     ^
   drivers/net/ethernet/mucse/rnp/rnp_mbx_fw.c:1456:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
    1456 | int rnp_mbx_lldp_all_ports_enable(struct rnp_hw *hw, bool enable)
         | ^
         | static
   drivers/net/ethernet/mucse/rnp/rnp_mbx_fw.c:1519:18: warning: array index 0 is past the end of the array (that has type 'char[0]', cast to 'int *') [-Warray-bounds]
    1519 |                 ret = ((int *)(cookie->priv))[0];
         |                                ^              ~
   drivers/net/ethernet/mucse/rnp/rnp_mbx_fw.h:60:2: note: array 'priv' declared here
      60 |         char priv[0];
skip........

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