ARM: SoC/OMAP GPMC driver cleanup and move for 3.19

The GPMC driver has traditionally been considered a part of the
OMAP platform code and tightly interweaved with some of the boards.

With this cleanup, it has finally come to the point where it makes
sense to move it out of arch/arm into drivers/memory, where we already
have other drivers for similar hardware. The cleanups are still
ongoing, with the goal of eventually having a standalone driver
that does not require an interface to architecture code.

This is a separate branch because of dependencies on multiple other
branches, and to keep the drivers changes separate from the normal
cleanups.
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