drm/omap: remove recommended_bpp

recommended_bpp hasn't been used for ages, remove the code.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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

@@ -1117,7 +1117,6 @@ static struct omap_dss_driver dsicm_ops = {
 	.sync		= dsicm_sync,
 
 	.get_resolution	= dsicm_get_resolution,
-	.get_recommended_bpp = omapdss_default_get_recommended_bpp,
 
 	.enable_te	= dsicm_enable_te,
 	.get_te		= dsicm_get_te,