efi: Find mirrored memory ranges for arm64

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4PM01
CVE: NA

--------------------------------

Mirrored memory could be used on HiSilion's arm64 SoC. So efi_find_mirror()
is added in efi_init() so that systems can get memblock about any mirrored
ranges.
Co-developed-by: NJing Xiangfeng <jingxiangfeng@huawei.com>
Signed-off-by: NMa Wupeng <mawupeng1@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

Documentation/admin-guide/kernel-parameters.txt

@@ -2226,7 +2226,7 @@
 
 	keepinitrd	[HW,ARM]
 
-	kernelcore=	[KNL,X86,IA-64,PPC]
+	kernelcore=	[KNL,X86,IA-64,PPC,ARM64]
 			Format: nn[KMGTPE] | nn% | "mirror"
 			This parameter specifies the amount of memory usable by
 			the kernel for non-movable allocations.  The requested

arch/arm64/kernel/setup.c

@@ -388,6 +388,7 @@ void __init __no_sanitize_address setup_arch(char **cmdline_p)
 	arm64_memblock_init();
 
 	efi_fake_memmap();
+	efi_find_mirror();
 
 	paging_init();