KVM: selftests: Make Hyper-V tests explicitly require KVM Hyper-V support

KVM: selftests: Make Hyper-V tests explicitly require KVM Hyper-V support

In preparation for conditional Hyper-V emulation enablement in KVM, make
Hyper-V specific tests skip gracefully instead of failing when KVM support
for emulating Hyper-V is not there.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Tested-by: Jeremi Piotrowski <jpiotrowski@linux.microsoft.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/r/20231205103630.1391318-10-vkuznets@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>