x86/mm: Fix memory encryption features advertisement

When memory encryption is enabled, the kernel prints the encryption
flavor that the system supports.

The check assumes that everything is AMD SME/SEV if it doesn't have
the TDX CPU feature set.

Hyper-V vTOM sets cc_vendor to CC_VENDOR_INTEL when it runs as L2 guest
on top of TDX, but not X86_FEATURE_TDX_GUEST. Hyper-V only needs memory
encryption enabled for I/O without the rest of CoCo enabling.

To avoid confusion, check the cc_vendor directly.

  [ bp: Massage commit message. ]

Signed-off-by: Kirill A. Shutemov <[email protected]>
Signed-off-by: Borislav Petkov (AMD) <[email protected]>
Reviewed-by: Jeremi Piotrowski <[email protected]>
Reviewed-by: Kuppuswamy Sathyanarayanan <[email protected]>
Acked-by: Tom Lendacky <[email protected]>
Acked-by: Kai Huang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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