bif: Add PMIC qpnp-bsi BIF controller driver

Add a BIF controller driver which is able to interact with the
BSI (battery serial interface) module found within QPNP compliant
PMIC devices.

Change-Id: I6d63da38e3e7e2b41ee29e75a861123ad3ce3c75
Signed-off-by: David Collins <collinsd@codeaurora.org>
4 files changed