drm/exynos: atomic phase 1: add .mode_set_nofb() callback
drm/exynos: atomic phase 1: add .mode_set_nofb() callback

The new atomic infrastructure needs the .mode_set_nofb() callback to
update CRTC timings before setting any plane.

v2: remove WARN_ON(!crtc->state) from mode_set_nofb

Signed-off-by: Gustavo Padovan <029a69b25713d0799b81c0a39685b4c040fa1425@collabora.co.uk>
Reviewed-by: Joonyoung Shim <b2207686f8c5343cf0f505ae1d5720ecb0c3202a@samsung.com>
Tested-by: Tobias Jakobi <4c4bdab7e8565a5c263c93a14c8947afdc7cdad5@math.uni-bielefeld.de>
Signed-off-by: Inki Dae <bae4a7a27bbc965064e97edd6e179ac4979db440@samsung.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs