regulator: rpm-smd-regulator: introduce BoB regulator type

The buck or boost (BoB) regulator is a new regulator type controlled by
the RPM. This new regulator will be used by BT, WLAN, EUD, and FLASH on
msmcobalt.

BoB uses the existing KVPs "swen" and "uv". It also defines four new KVPs:
"bobm" - BoB mode. There are four BoB modes which map to the standard
         regulator modes.
"pcv1" - Pin control 1 output voltage.
"pcv2" - Pin control 2 output voltage.
"pcv3" - Pin control 3 output voltage.

Change-Id: Id5d017ed65a73bfb7ed15477e3668c2f4f6b34e3
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>