regulator: cpr-regulator: add support for target quotient unpacking

Some SoCs have extremely limited fuse space.  In order to save
fuse bits, the CPR target quotients are packed to take up less
space.  Add support to unpack the target quotient for each fuse
corner using an offset and multiplier.

Change-Id: Ie1b49b8e881dbb239277876c8a4ae8603832e878
Signed-off-by: David Collins <collinsd@codeaurora.org>