power: bcl_peripheral: Add a new BCL peripheral driver

Add a new BCL peripheral driver, which implements interfaces
to configure and interact with PMIC BCL peripheral.

This BCL peripheral driver registers with the BCL
framework to be used by the top level BCL mitigation
modules.

Change-Id: I2d9c0a465d887b5fecdb9d266bbef61c6ac9f014
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>