x86/cpu: Add hardware-enforced cache coherency as a CPUID feature

In some hardware implementations, coherency between the encrypted and
unencrypted mappings of the same physical page is enforced. In such a system,
it is not required for software to flush the page from all CPU caches in the
system prior to changing the value of the C-bit for a page. This hardware-
enforced cache coherency is indicated by EAX[10] in CPUID leaf 0x8000001f.

 [ bp: Use one of the free slots in word 3. ]

Suggested-by: Tom Lendacky <[email protected]>
Signed-off-by: Krish Sadhukhan <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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