[OMAP4/5]: ABB: dont hardcode number of voltage domains

Dont hardcode number of voltage domains for ABB - else
it is harder to introduce support for newer SoCs

Signed-off-by: Nishanth Menon <nm@ti.com>
[DRA7] Add Adaptive Body Bias(ABB) support

Support omapconf show abb and omapconf dump abb to see
the Adaptive Body Bias status

Signed-off-by: Nishanth Menon <nm@ti.com>
Merge pull request #30 from nmenon/dra7-abb

Add support for Dra7 abb