[Intel-gfx] [PATCH i-g-t 1/5] kms: Add universal plane support

[Damien Lespiau]

As a small summary, I don't think we should be exposing the
plane_commit() function and always go through igt_display_commit() to
make hooking the atomic ioctl() easier. Loosing the plane ordering is a
bit meh but should be able to live with it. The rest looks good.

-- 
Damien