msm: cpr-regulator: enable CPR_DEBUG_MASK_IRQ by default

A storm of CPR interrupts was found on some incorrectly fused parts.
Enable IRQ debug messages to catch the issue so that we can identify
the bad parts based upon the kernel log.

Change-Id: Ifa574fafffe696b67cfe9e933e83af9083673bc6
Signed-off-by: Willie Ruan <wruan@codeaurora.org>