Initial B&N Nook Color support, take six

Hello!

Next attempt at B&N Nook Color board file submission.
USB peripheral mode is fully operational as is serial console and
MMC/SDCard.

Dramatically cut number of includes in the board file again.
No longer set voltage regulator dev, just device name in the supply.
Style fixes
Serial in uncompress.h sorted by name
Corrected MUX package to CBP in board file.
omap_i2c_init now has no return since it's unused anyway.
Fixed keypad definition.

since v2:
rebased on devel-cleanup branch

since v1:
Threw away all the android stuff as suggested 
Cleaned up voltage regulators and removed the ones our twl chip actually
  does not have
Changed the split of the patches to board file + twl update

Bye,
 Oleg

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