drm/panel: panel-dsi-cm: use MIPI_DCS_GET_ERROR_COUNT_ON_DSI

Use the common MIPI_DCS_GET_ERROR_COUNT_ON_DSI define instead of
driver's own.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201215104657.802264-56-tomi.valkeinen@ti.com

drivers/gpu/drm/panel/panel-dsi-cm.c

@@ -26,7 +26,6 @@
 #include <video/of_display_timing.h>
 #include <video/videomode.h>
 
-#define DCS_READ_NUM_ERRORS	0x05
 #define DCS_GET_ID1		0xda
 #define DCS_GET_ID2		0xdb
 #define DCS_GET_ID3		0xdc
@@ -224,7 +223,7 @@ static ssize_t num_dsi_errors_show(struct device *dev,
 	mutex_lock(&ddata->lock);
 
 	if (ddata->enabled)
-		r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS, &errors);
+		r = dsicm_dcs_read_1(ddata, MIPI_DCS_GET_ERROR_COUNT_ON_DSI, &errors);
 
 	mutex_unlock(&ddata->lock);