soc: qcom: rpmh: Add completion status to rpmh debug information

Linux kernel lockup case can be either due to RSC interrupt
pending at GIC unable to service or due to completion did not
get a chance to run and finish.

Currently rpmh debug only prints pending IRQ status at GIC.
Add completion status as well to rpmh debug information.

Change-Id: Iaee639f744be19c2cffb701547623c19bdabfb30
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>