clh: Add confidential_guest to the config file

ConfidentialGuest is an option already present and exposed for QEMU,
which is used for using Kata Containers together with different sorts of
Guest Protections, such as TDX and SEV for x86_64, PEF for ppc64le, and
SE for s390x.

Right now we error out in case confidential_guest is enabled, as we will
be implementing the needed blocks for this as part of this series.

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

src/runtime/pkg/katautils/config.go

@@ -877,6 +877,7 @@ func newClhHypervisorConfig(h hypervisor) (vc.HypervisorConfig, error) {
 		SGXEPCSize:              defaultSGXEPCSize,
 		EnableAnnotations:       h.EnableAnnotations,
 		DisableSeccomp:          h.DisableSeccomp,
+		ConfidentialGuest:       h.ConfidentialGuest,
 	}, nil
 }