bcm2835 (Raspberry Pi) KMS driver

[Eric Anholt]

This is a respin of the Raspberry Pi KMS series.  Now that we've got a
real clock driver, I can actually set new video modes.  Also in this
version, most of the custom DT stuff from before is gone, thanks to
finding exynos's platform_driver component matching code (I have sent
separate patches to drivers/base to make helpers for doing it).

https://github.com/anholt/linux/tree/vc4-kms-squash-2