disp: msm: dsi: add DCS get scan line command

Add DCS command to read the panel scan line value and associated
time stamp in nano-seconds.

Change-Id: I06a76d3a6c5ad7a2e7681413c741e5b97b34d73f
Signed-off-by: Amine Najahi <quic_anajahi@quicinc.com>

msm/sde/sde_kms.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights reserved.
  * Copyright (c) 2014-2021, The Linux Foundation. All rights reserved.
  * Copyright (C) 2013 Red Hat
  * Author: Rob Clark <robdclark@gmail.com>
@@ -1834,6 +1834,7 @@ static int _sde_kms_setup_displays(struct drm_device *dev,
 		.set_submode_info = dsi_conn_set_submode_blob_info,
 		.get_num_lm_from_mode = dsi_conn_get_lm_from_mode,
 		.update_transfer_time = dsi_display_update_transfer_time,
+		.get_panel_scan_line = dsi_display_get_panel_scan_line,
 	};
 	static const struct sde_connector_ops wb_ops = {
 		.post_init =    sde_wb_connector_post_init,