First feature pile for 4.12:

- use atomic_commit for legay page flips, once more! (from Maarten)
- piles and piles of fixes and patches to make corner-cases more
  robust in atomic code, execlist, gem, from lots of different folks
- remove pre-production w/a for bxt (Chris)
- taint the kernel on pre-production hw that's no longer supported
  (Chris)
- consistently treat stolen as dma_addr_t (Chris)
- vgpu forcewake cleanup (Weinan Li)
- glk color manager support (Ander)
- explicit fencing support in execbuf, for Android! (Chris)
- ... plus the remaining prep-work for the same (also Chris)
- dp compliance prep (Manasi and Jani)
- cleanup skl/kbl code under IS_GEN9_BC (for "big core"), from Rodrigo