omapdrm supports atomic modesetting, and it seems to work ok. So let's
set the flag to enable the atomic modesetting API support.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 };
 
 static struct drm_driver omap_drm_driver = {
-       .driver_features = DRIVER_MODESET | DRIVER_GEM  | DRIVER_PRIME,
+       .driver_features = DRIVER_MODESET | DRIVER_GEM  | DRIVER_PRIME |
+               DRIVER_ATOMIC,
        .load = dev_load,
        .unload = dev_unload,
        .open = dev_open,