drm/i915: ValleyView watermark support

Add support for ValleyView watermark handling.

v2: remove unused reg & bit definitions (Ben)

Acked-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2 files changed