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