drm/exynos/gsc: Add rotation hardware limits of gscaler

drm/exynos/gsc: Add rotation hardware limits of gscaler

The gscaler has hardware rotation limits that need to be imported from
dts. Parse them and add them to the property list.

The rotation hardware limits are related to the cropped source size.
When swap occurs, use rot_max size instead of crop_max size.

Also the scaling limits are related to post size, use pos size to
check the limits.

Change-Id: I081568c20ac5b30e5decd76498b39bacf29829b6
Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>