Do some further clean up based on the initial review of
drm/i915: Separate cherryview from valleyview.

In this case remove a hack for VLV A0.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: NWayne Boyer <wayne.boyer@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1449514270-15171-4-git-send-email-wayne.boyer@intel.comReviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com>