ARM: arm-soc: late cleanups for omap

From Tony Lindgren:
Here are few more patches to finish the omap changes for
multiplatform conversion that are not strictly fixes, but
were too complex to do with the dependencies during the
merge window. Those are to move of serial-omap.h to
platform_data, and the removal of remaining cpu_is_omap
macro usage outside mach-omap2.

Then there are several trivial fixes for typos and few
minimal omap2plus_defconfig updates.
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