drm/amd/display: fix hotplug regression after code refactor

The condition logic of REG_WAIT in dce110_stream_encoder_dp_blank()
got inverted after refactoring.
Signed-off-by: Roman Li <Roman.Li@amd.com>
Reviewed-by: Jordan Lazare <Jordan.Lazare@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.c

@@ -635,7 +635,7 @@ static void dce110_stream_encoder_dp_blank(
 	*/
 
 	REG_WAIT(DP_VID_STREAM_CNTL, DP_VID_STREAM_STATUS,
-			1,
+			0,
 			10, max_retries);
 
 	ASSERT(retries <= max_retries);