drm/amd/display: Update MST edid property every time

Extended fix to: "Don't read EDID in atomic_check"

Fix display property not observed in GUI display after hot plug.

Call drm_mode_connector_update_edid_property every time in
.get_modes hook, due to the fact that edid property is getting
removed from usermode ioctl DRM_IOCTL_MODE_GETCONNECTOR each time
in hot unplug.
Signed-off-by: Jerry (Fangzhi) Zuo <Jerry.Zuo@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c

@@ -253,10 +253,10 @@ static int dm_dp_mst_get_modes(struct drm_connector *connector)
 		if (aconnector->dc_sink)
 			amdgpu_dm_add_sink_to_freesync_module(
 					connector, edid);
+	}
 
 	drm_mode_connector_update_edid_property(
-						&aconnector->base, edid);
-	}
+					&aconnector->base, aconnector->edid);
 
 	ret = drm_add_edid_modes(connector, aconnector->edid);