omap-for-v3.8/cleanup-headers-serial-take2-signed

These changes remove plat/serial.h usage for omap2+.

Note that this branch is based on a tty commit 3e9a6321
(tty/serial/8250: Make omap hardware workarounds local to 8250.h)
merged with omap-for-v3.8/cleanup-headers-signed.

The tty commit is needed to keep things compiling for omaps,
and omap-for-v3.8/cleanup-headers-signed is needed to avoid
multiple merge conflicts with the includes. I've verified
with Greg KH that the tty commit above is immutable and OK
to use as a base.
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