x86/kexec: Add the ACPI NVS region to the ident map

With the recent addition of RSDP parsing in the decompression stage,
a kexec-ed kernel now needs ACPI tables to be covered by the identity
mapping. And in commit

  6bbeb276b71f ("x86/kexec: Add the EFI system tables and ACPI tables to the ident map")

the ACPI tables memory region was added to the ident map.

But some machines have only an ACPI NVS memory region and the ACPI
tables are located in that region. In such case, the kexec-ed kernel
will still fail when trying to access ACPI tables if they're not mapped.

So add the NVS memory region to the ident map as well.

 [ bp: Massage. ]

Fixes: 6bbeb276b71f ("x86/kexec: Add the EFI system tables and ACPI tables to the ident map")
Suggested-by: Junichi Nomura <[email protected]>
Signed-off-by: Kairui Song <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Tested-by: Junichi Nomura <[email protected]>
Cc: Baoquan He <[email protected]>
Cc: Chao Fan <[email protected]>
Cc: Dave Young <[email protected]>
Cc: Dirk van der Merwe <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: [email protected]
Cc: Lianbo Jiang <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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