[ARM] 2888/1: OMAP 3/4: Update omap include files, take 2

Patch from Tony Lindgren

This patch syncs the mainline kernel with linux-omap tree.
The highlights of the patch are:
- Start adding 24xx support by Paul Mundt
- Clean-up of cpu detection by Dirk Behme and Tony Lindgren
- Add DSP header by Toshihiro Kobayashi
- Add support for mtd-xip by Vladimir Barinov
- Add various new mux registers
- Move OMAP specific serial defines back to serial.h

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>