ARM: dts: msm: Add the pmic-wd-bark irq to PM8110 power-on

Unknown PMIC watchdog resets are found on PM8110 devices. Add the
pmic-wd-bark irq to the power-on node in order to facilitate debugging
efforts.

Change-Id: Ib794c283592191b3d41970495cab1d7669f15dac
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>