drm/exynos: remove legacy ->suspend()/resume()
drm/exynos: remove legacy ->suspend()/resume()

These legacy helpers should only be used by shadow-attaching drivers.
KMS drivers has its own way to handle suspend/resume and don't need to
use these two helpers.

Signed-off-by: Gustavo Padovan <029a69b25713d0799b81c0a39685b4c040fa1425@collabora.co.uk>
Signed-off-by: Inki Dae <91cd9cd4a7d669aee28c83bea415fb641869aade@gmail.com>

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