drm/i915: Update to Linux 3.10

drm/i915: Update to Linux 3.10

* Page flip improvements, increased robustness after GPU hangs.
  Races have been fixed in the vblank and pageflip completion
  interrupt handlers of GEN2-GEN4 GPUs.

* Hotplug IRQ storm detection and mitigation.

* Various bug fixes and performance improvements from GEN4 to
  Haswell GPUs.
  Less "Unclaimed register" messages should be visible on Haswell.

* Improved support for Valleyview / Baytrail GPUs.

* Better overclocking support from Sandy Bridge to Haswell.
  Improved frequency scaling (turbo) on Haswell.

* Improved display detection and modesetting. It is now possible to
  precompute possible desired display pipe configurations without
  changing the hardware state.

* Daniel Vetter's blog contains more detailed information:
  http://blog.ffwll.ch/2013/04/neat-drmi915-stuff-for-310.html