regulator: cpr-regulator: Fix CPR initialization code for invalid quotients

Allow normal CPR driver initialization even when the fused CPR
target quotients are invalid so that necessary data structures
are allocated and initialized.  The device is allowed to run
using open-loop voltages with CPR disabled in this case.

CRs-Fixed: 823331
Change-Id: Iff1bf978290571df8e757c6eaf8b168e2be8972c
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>