ACPI / APEI: Replace ioremap_page_range() with fixmap

Replace ghes_io{re,un}map_pfn_{nmi,irq}()s use of ioremap_page_range()
with __set_fixmap() as ioremap_page_range() may sleep to allocate a new
level of page-table, even if its passed an existing final-address to
use in the mapping.

The GHES driver can only be enabled for architectures that select
HAVE_ACPI_APEI: Add fixmap entries to both x86 and arm64.

clear_fixmap() does the TLB invalidation in __set_fixmap() for arm64
and __set_pte_vaddr() for x86. In each case its the same as the
respective arch_apei_flush_tlb_one().

Reported-by: Fengguang Wu <[email protected]>
Suggested-by: Linus Torvalds <[email protected]>
Signed-off-by: James Morse <[email protected]>
Reviewed-by: Borislav Petkov <[email protected]>
Tested-by: Tyler Baicar <[email protected]>
Tested-by: Toshi Kani <[email protected]>
[ For the arm64 bits: ]
Acked-by: Will Deacon <[email protected]>
[ For the x86 bits: ]
Acked-by: Ingo Molnar <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Cc: All applicable <[email protected]>

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