drm/radeon/kms: rework DP bridge checks

Return the encoder id rather than a boolean.  This is needed
for differentiate between multiple DP bridge chips.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 6adb3e5..07ac481 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -708,7 +708,8 @@
 
 	if ((radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_DisplayPort) ||
 	    (radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) ||
-	    radeon_connector_encoder_is_dp_bridge(&radeon_connector->base)) {
+	    (radeon_connector_encoder_get_dp_bridge_encoder_id(&radeon_connector->base) !=
+	     ENCODER_OBJECT_ID_NONE)) {
 		struct radeon_connector_atom_dig *dig = radeon_connector->con_priv;
 
 		if ((dig->dp_sink_type == CONNECTOR_OBJECT_ID_DISPLAYPORT ||