drm/omap: define compat_ioctl

Define compat_ioctl in omapdriver_fops to make it possible to use 32bit
apps on 64bit platform.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>

drivers/gpu/drm/omapdrm/omap_drv.c

@@ -493,6 +493,7 @@ static const struct file_operations omapdriver_fops = {
 	.owner = THIS_MODULE,
 	.open = drm_open,
 	.unlocked_ioctl = drm_ioctl,
+	.compat_ioctl = drm_compat_ioctl,
 	.release = drm_release,
 	.mmap = omap_gem_mmap,
 	.poll = drm_poll,