ARM: SoC multiplatform code changes for v4.1

The changes here belong to two main platforms:

- Atmel At91 is flipping the bit and going multiplatform. This includes some
  cleanups and removal of code, and the final flip of config dependencies

- Shmobile has several platforms that are going multiplatform, but this
  branch also contains a bunch of cleanups that they weren't able to keep
  separate in a good way. THere's also a removal of one of their SoCs and the
  corresponding boards (sh7372 and mackerel).
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