regulator: cpr4-apss: Add support for sdm632 apss cpr instances

sdm632 CPU CPR controller support hardware autonomous closed-loop
cpr operation. Extend the cpr4-apps-regulator driver to handle
CPU subsystem specific power requirements of the sdm632 chip.

Change-Id: Ic12b6c9ab5195125cf0c0b78daa27492291e7aac
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>