crypto: ccp - add SEV command privilege separation

Currently, there is no privilege separation of the SEV command; you can
run them all or none of them. This is less than ideal because it means
that a compromise of the code which launches VMs could make permanent
change to the SEV certifcate chain which will affect others.

These commands are required to attest the VM environment:
 - SEV_PDH_CERT_EXPORT
 - SEV_PLATFORM_STATUS
 - SEV_GET_{ID,ID2}

These commands manage the SEV certificate chain:
 - SEV_PEK_CERR_IMPORT
 - SEV_FACTORY_RESET
 - SEV_PEK_GEN
 - SEV_PEK_CSR
 - SEV_PDH_GEN

Lets add the CAP_SYS_ADMIN check for the group of the commands which alters
the SEV certificate chain to provide some level of privilege separation.

Cc: Herbert Xu <[email protected]>
Cc: Gary Hook <[email protected]>
Cc: Erdem Aktas <[email protected]>
Cc: Tom Lendacky <[email protected]>
Tested-by: David Rientjes <[email protected]>
Co-developed-by: David Rientjes <[email protected]>
Signed-off-by: David Rientjes <[email protected]>
Signed-off-by: Brijesh Singh <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>

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