[Intel-gfx] patches on my 'for-anholt' branch

[Zhenyu Wang]

Eric, I've queued some patches on my 'for-anholt' branch of
drm-intel tree. The first and second ones are resent patch for
fixing eDP through PCH DP port. And following patches are
watermark fixes that recently investigated by Yakui.

The last one is FBC enabling patch for Ironlake, after Yakui
fixed flicker issue with origin FBC enabling patch by programming
the cursor wm properly from an Ironlake sighting.

Thanks.