Define a PCD 'PcdMonitorConduitHvc' to select the conduit to use for monitor calls. PcdMonitorConduitHvc is defined as FALSE by default, meaning the SMC conduit is enabled as default. Adding PcdMonitorConduitHvc allows selection of HVC conduit to be used by virtual firmware implementations. Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com> Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>