KVM: arm64: Check whether a VM IOCTL is allowed in pKVM

KVM: arm64: Check whether a VM IOCTL is allowed in pKVM

Certain VM IOCTLs are tied to specific VM features. Since pKVM does not
support all features, restrict which IOCTLs are allowed depending on
whether the associated feature is supported.

Use the existing VM capability check as the source of truth to whether
an IOCTL is allowed for a particular VM by mapping the IOCTLs with their
associated capabilities.

Suggested-by: Oliver Upton <oupton@kernel.org>
Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20251211104710.151771-9-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>