regulator: cpr-regulator: print regulator name in all log messages

Update all kernel log printing statements in the cpr-regulator
driver so that they include the name of the regulator that the
message corresponds to.  This ensures that it is possible to
distinguish messages generated by different regulator devices on
boards that have more than one cpr-regulator device.

Change-Id: I84c7a85ce98375e450a65a3623d407a626324cfe
Signed-off-by: David Collins <collinsd@codeaurora.org>