drm: Platform helpers for exynos-style component registration.

[Eric Anholt]

I had previously modeled vc4 off of msm's component driver
registration, but on further investigation exynos has an even cleaner
way of doing it.  Here's a series to turn exynos's style into core
helpers, and use it from msm.

The patches are build tested, but I don't have either of the platforms
to test on.

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