drm: Update to Linux 4.12.14

* Initial Geminilake support

* Support improvements and model-specific bug fixes for Broxton, Haswell,
Broadwell, Skylake and Kabylake hardware

* Various generic i91

drm: Update to Linux 4.12.14

* Initial Geminilake support

* Support improvements and model-specific bug fixes for Broxton, Haswell,
Broadwell, Skylake and Kabylake hardware

* Various generic i915 bug fixes, including page flipping and memory
corruption issues

* Minor radeon bug fixes

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kernel/apple_gmux: Add missing opt_ddb.h to the Makefile and sort.

drm includes: Rename uapi_xxx to uapi/xxx

Making the include hierarchy 100% compatible with the Linux one.

kernel: Move apple_gmux to sys/gnu/dev/misc/