regulator: cpr3-regulator: support disabling CPRh hardware closed-loop

Allow disabling CPR hardware closed-loop operation via debugfs
on CPRh-compliant controllers. This can be done by setting
either cpr_closed_loop_enable or use_hw_closed_loop to zero.
Both flags must be set to reallow CPRh hardware closed-loop
operation.

CRs-Fixed: 1054095
Change-Id: Ib41f389ab168a747e705446dc621e512f6c95e1a
Signed-off-by: Osvaldo Banuelos <osvaldob@codeaurora.org>