在ARM64架构下，支持UEFI模式 · Pull Request !102 · src-openEuler/kiwi

当前KIWI的版本无法支持ARM64的UEFI启动。如果将firmware设置成uefi，则会出现如下错误：
```
[  486s] [ INFO    ]: 19:24:24 | No grub boot code installation on aarch64
```
原因时当前源码遇到是ARM64就不进行UEFI的bootloader安装操作。
```
1523             if bootloader.install_required():
1524                 bootloader.install()
```

```
95     def install_required(self):
96         """
97         Check if grub2 has to be installed
98 
99         Take architecture and firmware setup into account to check if
100         bootloader code in a boot record is required
101 
102         :return: True or False
103 
104         :rtype: bool
105         """
106         if 'ppc64' in self.arch and self.firmware.opal_mode():
107             # OPAL doesn't need a grub2 stage1, just a config file.
108             # The machine will be setup to kexec grub2 in user space
109             log.info(
110                 'No grub boot code installation in opal mode on %s', self.arch
111             )
112             return False
113         elif 'arm' in self.arch or self.arch == 'aarch64':
114             # On arm grub2 is used for EFI setup only, no install
115             # of grub2 boot code makes sense
116             log.info(
117                 'No grub boot code installation on %s', self.arch
118             )
119             return False
```

解决方法：
backport上游补丁，重构bootloader install的结构。
如果发现shim-install存在，就直接调用shim-install进行bootloader安装。就可以解决ARM64的UEFI支持的问题。

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