drm/radeon: Update to Linux 4.4.180

* Bugfixes and workaround for hardware issues, including
quirks for various R7 370 and R9 270 models

* VT switching fixes from dillon@

* Fan management improv

drm/radeon: Update to Linux 4.4.180

* Bugfixes and workaround for hardware issues, including
quirks for various R7 370 and R9 270 models

* VT switching fixes from dillon@

* Fan management improvements

* Improved support for 120+ Hz monitors

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