Remaining patches to allow omap2+ to build with multiplatform

enabled. Unfortunately the DMA header patch had to be redone
to avoid adding new multiplatform specific include paths, the
other patches are just trivial compile fixes.

Note that this does not yet contain the necessary Kconfig
changes as we are still waiting for some drivers to get
fixed up first. Also this branch is missing the common clock
framework changes that are queued separately.
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