efi: Stub mirrored_kernelcore if CONFIG_HAVE_MEMBLOCK_NODE_MAP is not enabled

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S
CVE: NA

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Stub mirrored_kernelcore if CONFIG_HAVE_MEMBLOCK_NODE_MAP is not enabled.
If CONFIG_HAVE_MEMBLOCK_NODE_MAP is disabled, mirrored_kernelcore in
efi_find_mirror() will be undeclared and this will lead to compile problem.

Fixes: d7421c3f ("efi: Disable mirror feature if kernelcore is not spcified")
Signed-off-by: NMa Wupeng <mawupeng1@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

include/linux/mm.h

@@ -2272,6 +2272,8 @@ extern void sparse_memory_present_with_active_regions(int nid);
 
 extern bool mirrored_kernelcore;
 
+#else
+#define mirrored_kernelcore 0
 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
 
 #if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \