regulator: cpr-regulator: support CPR closed loop based on the fuse version

In some SoCs, CPR closed loop should not be enabled for certain
CPR fusing revisions. Currently, there is no support to disable the
closed loop operation based on the fuse version. Add support for that
through qcom,cpr-allowed property.

The above property is tied with qcom,cpr-fuse-version-map property
so that this can be supported well for a particular fuse revision or
PVS bin or speed bin.

CRs-Fixed: 780871
Change-Id: I7d315d0d739d60d755f2d3c40f4568c3c5f42bc9
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>