drm/i915: Move chv rotation checks to plane->check()

Move the chv rotation vs. reflections checks to the plane->check() hook,
away from the (now) platform agnostic
intel_plane_atomic_check_with_state().

Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180907152413.15761-13-ville.syrjala@linux.intel.com