linux-imx

drm/exynos: remove platform data structures and include/drm/exynos_drm.h

Platform data structures are not used for long time so the whole header
file can be safely removed.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>