soc: wdog: implement irq tracker to get stats

Implement IRQ tracker for information:
1) Top 10 device IRQ's with count.
2) Per cpu total irq counts.
3) Per IPI total count.
Tracker will be invoked from watchdog pet,
watchdog bark and kernel panics.

Change-Id: I5159e122e25a7bbf389be4d5f57753378c7afb6d
Signed-off-by: Prateek Sood <prsood@codeaurora.org>