drm/i915/hdcp: Check mst_port to determine connector type

Check mst_port field in intel_connector to check connector type
rather than rely on encoder as it may not be attached to connector
at times.

--v2
-Add closes tag [Imre]

Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/10898Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240521081458.1500327-3-suraj.kandpal@intel.com

drivers/gpu/drm/i915/display/intel_dp_hdcp.c

@@ -693,7 +693,7 @@ int intel_dp_hdcp_get_remote_capability(struct intel_connector *connector,
 
 	*hdcp_capable = false;
 	*hdcp2_capable = false;
-	if (!intel_encoder_is_mst(connector->encoder))
+	if (!connector->mst_port)
 		return -EINVAL;
 
 	aux = &connector->port->aux;