regulator: cpr3-hmss-regulator: add support for CBF voltage offset fuses

Add support for the CBF open-loop/closed-loop voltage offset
fuses found on MSM8996-Pro chips.  These fuses define independent
open-loop voltages and closed-loop target quotients for the power
cluster and CBF clock which share CPR hardware thread 0.  This
independent fusing ensures optimal VDD supply voltage for all
power cluster, performance cluster, CBF corner combinations.

Change-Id: I2e309d683f853f8bd9fd4eb6d12b05c32c7aaf26
CRs-Fixed: 980901
Signed-off-by: David Collins <collinsd@codeaurora.org>