x86: CPUID and CR3/CR4 flags for Linear Address Masking

x86: CPUID and CR3/CR4 flags for Linear Address Masking

Enumerate Linear Address Masking and provide defines for CR3 and CR4
flags.

The new CONFIG_ADDRESS_MASKING option enables the feature support in
kernel.

Signed-off-by: Kirill A. Shutemov <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
Reviewed-by: Alexander Potapenko <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Tested-by: Alexander Potapenko <[email protected]>
Link: https://lore.kernel.org/all/20230312112612.31869-4-kirill.shutemov%40linux.intel.com