The atmel-hlcdc driver already supports atomic operations, add the
missing DRM_ATOMIC flag to expose the atomic features to userspace.
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
 
 static struct drm_driver atmel_hlcdc_dc_driver = {
        .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM |
-                          DRIVER_MODESET | DRIVER_PRIME,
+                          DRIVER_MODESET | DRIVER_PRIME |
+                          DRIVER_ATOMIC,
        .preclose = atmel_hlcdc_dc_preclose,
        .lastclose = atmel_hlcdc_dc_lastclose,
        .irq_handler = atmel_hlcdc_dc_irq_handler,