tools: inform user which CVM is found during validation

tools: inform user which CVM is found during validation

For AMD, the virt-host-validate 'secure guest' check reports
support for SEV, and there are then further check results
printed for SEV-ES/SEV-SNP which are overly verbose and the
long lines break output alignment.

This uses the new ability to report details with PASS results
to concisely tell the user which out of SEV/SEV-ES/SEV-SNP
are found. Only a single answer is neede, as SEV-SNP implies
SEV & SEV-ES, and SEV-ES implies SEV.

The TDX s390x PROT-VIRT checks also identify themselves.

Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>