ARM: SoC: late cleanups

These could not be part of the first cleanup branch, because they either
came too late in the cycle, or they have dependencies on other branches.
Important changes are:

* The integrator platform is almost multiplatform capable after
  some reorganization (Linus Walleij)
* Minor cleanups on Zynq (Michal Simek)
* Lots of changes for Exynos and other Samsung platforms, including
  further preparations for multiplatform support and the clocks bindings
  are rearranged.
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