uefirtmisc: add unsupported checking with RuntimeServicesSupported variable

UEFI spec 2.8 introduced the variable RuntimeServicesSupported, which is
Bitmask of which calls are implemented by the firmware during runtime services.
Add tests for checking GetNextHighMonotonicCount services with
RuntimeServicesSupported variable. Currently, won't test with
QueryCapsuleCapabilities becasue QueryCapsuleCapabilities may return
unsupported due to the update flag of firmware behavior unsupported, not
runtime service unsupported.

Signed-off-by: Ivan Hu <ivan.hu@canonical.com>
Acked-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Alex Hung <alex.hung@canonical.com>