regulator: cpr3-regulator: add support to ignore invalid fuse values

Some simulator targets do not initialize fuse values.  This
causes CPR3 controller devices to fail to probe due to sanity
checks.  Make these checks conditional upon a boolean device tree
property so that CPR3 controllers can be tested on all simulator
targets.

Change-Id: Ib87b7eb46ea4842480dc09e43241e19190344672
Signed-off-by: David Collins <collinsd@codeaurora.org>