[PATCH] Subject: Add original BBBIO PWM driver to BBB BSP

[punit vara]

I have added registers definitions to am335x.h those are used in
BBBIO. Mainly I added so that we can know this much of register right
now BBBIO is using and I will add more definitions in second commit so
that we can track that new changes required that definitions. If you
say I will only add BBBIO code and  one header file. What is opinion
from others ?