drm/panel: mantix: Enable DSI LPM

This improves reliability of sending DSI commands.

Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260105-mantix-halo-fixes-v1-1-1ebc9b195a34@puri.sm

Author: dos1

drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c

@@ -258,7 +258,7 @@ static int mantix_probe(struct mipi_dsi_device *dsi)
 
 	dsi->lanes = 4;
 	dsi->format = MIPI_DSI_FMT_RGB888;
-	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM |
 		MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
 
 	ctx->avdd = devm_regulator_get(dev, "avdd");