soc: qcom: watchdog_v2: optimize ipi ping mechanism

Add support to optimize the ipi ping mechanism where we do not ping a cpu
if it is in low power mode while petting the watchdog. This optimization
can be enabled with boot parameter.

Change-Id: I77e36a7ae1a16e0586dfc221ccd12804f6887aed
Signed-off-by: Sarangdhar Joshi <spjoshi@codeaurora.org>