For CRTCs that doesn't support rotation should still return
DRM_MODE_ROTATE_0. Since both OVL and OVL adaptor on MTK chip
doesn't support rotation, return the capability of the
hardware accordingly.
Fixes: df4444577118 ("drm/mediatek: Support 180 degree rotation")
Fixes: 84d805753983 ("drm/mediatek: Support reflect-y plane rotation")
Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>