x86/sev: Detect/setup SEV/SME features earlier in boot

x86/sev: Detect/setup SEV/SME features earlier in boot

sme_enable() handles feature detection for both SEV and SME. Future
patches will also use it for SEV-SNP feature detection/setup, which
will need to be done immediately after the first #VC handler is set up.
Move it now in preparation.

Signed-off-by: Michael Roth <[email protected]>
Signed-off-by: Brijesh Singh <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Venu Busireddy <[email protected]>
Link: https://lore.kernel.org/r/[email protected]