drm: Update to Linux 4.15.18

* Create /dev/dri/renderD* devices
Generally handle /dev entries creation as close to Linux as possible.

* Add drm master support
Sync authentification code with Li

drm: Update to Linux 4.15.18

* Create /dev/dri/renderD* devices
Generally handle /dev entries creation as close to Linux as possible.

* Add drm master support
Sync authentification code with Linux 4.15.18

* handle vm_mm->mmap_sem in ttm page fault operations

* Update dma-fence code from OpenBSD

* This commit contains sleep/wakeup and other changes
from Matthew Dillon <dillon@apollo.backplane.com>

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drm/i915: Upgrade to Linux 4.0

* Basic Skylake support

* Panel Self-Refresh (PSR) now supported on Valleyview and Cherryview

* Preparations for atomic display updates

* Performance improvements o

drm/i915: Upgrade to Linux 4.0

* Basic Skylake support

* Panel Self-Refresh (PSR) now supported on Valleyview and Cherryview

* Preparations for atomic display updates

* Performance improvements on various GPU families, including Cherryview,
Broadwell and Haswell

* GPU frequencies are now kept at a minimum of 450MHz when possible
on Haswell and Broadwell, ensuring a minimum experience level for
various types of workloads

* Improved reset support for gen3/4 GPUs, which should fix some OpenGL
crashes on Core 2 and pre-2012 Atom machines

* Better sound/graphics driver synchronization for audio over hdmi support

* As usual, small bugfixes and stability improvements here and there

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