drm/amd/display: Fix ASSR enablement on DP to EDP converter

ASSR mode is not enable when we connect eDP panel via DP to eDP converter.
connector_signal is coming as SIGNAL_TYPE_DISPLAY_PORT. Present code
ignoring panel_mode_edp for SIGNAL_TYPE_DISPLAY_PORT. Added checking
panel_mode_edp for all signals.
Signed-off-by: Ayyappa Chandolu <Ayyappa.Chandolu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/core/dc_link_hwss.c

@@ -203,10 +203,10 @@ enum dp_panel_mode dp_get_panel_mode(struct core_link *link)
 		default:
 			break;
 		}
+	}
 
-		if (link->dpcd_caps.panel_mode_edp) {
-			return DP_PANEL_MODE_EDP;
-		}
+	if (link->dpcd_caps.panel_mode_edp) {
+		return DP_PANEL_MODE_EDP;
 	}
 
 	return DP_PANEL_MODE_DEFAULT;