UPSTREAM: x86/pci: Fix the function type for check_reserved_t

e820__mapped_all() is passed as a callback to is_mmconf_reserved(),
which expects a function of type:

  typedef bool (*check_reserved_t)(u64 start, u64 end, unsigned type);

However, e820__mapped_all() accepts enum e820_type as the last argument
and this type mismatch trips indirect call checking with Clang's
Control-Flow Integrity (CFI).

As is_mmconf_reserved() only passes enum e820_type values for the
type argument, change the typedef and the unused type argument in
is_acpi_reserved() to enum e820_type to fix the type mismatch.

Bug: 210705746
(cherry picked from commit 83321c335dccba262a57378361d63da96b8166d6)
Reported-by: Sedat Dilek <sedat.dilek@gmail.com>
Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20201130193900.456726-1-samitolvanen@google.com
Change-Id: I92f78710ac55d5f567ad73053fc9f8c7cef68f71
(cherry picked from commit 7d1d5848183bd1d9086d0572f9af431d3ded407f)
(cherry picked from commit 8f54ba9ae7e38e315df32f5338665a1e44cd1a4b)