x86/mce: Check MCi_STATUS[MISCV] for usable addr on Intel only

mce_usable_address() does a bunch of basic sanity checks to verify
whether the address reported with the error is usable for further
processing. However, we do check MCi_STATUS[MISCV] and that is not
needed on AMD as that bit says that there's additional information about
the logged error in the MCi_MISCj banks.

But we don't need that to know whether the address is usable - we only
need to know whether the physical address is valid - i.e., ADDRV.

On Intel the MISCV bit is needed to perform additional checks to determine
whether the reported address is a physical one, etc.

Signed-off-by: Borislav Petkov <[email protected]>
Cc: Yazen Ghannam <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: linux-edac <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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