regulator: cprh-kbss: add support for sdm660 kbss cpr instances

sdm660 CPU CPR controllers support full hardware closed-loop CPR
operation also known as CPR hardening. Extend the cprh-kbss-regulator
driver to handle CPU subsystem specific power requirements of
the sdm660 chip.

CRs-Fixed: 1105923
Change-Id: I2e24a061a5ad4ee959dd578da9e811ac7700702c
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>