ARM: dts: msm: Change the pet timeout as per granularity limit

The new timer wheel avoid cascading down the timers, this comes
on relaxed granularity and for in place expiry of timers.
Adjust pet timer granularity accorddingly.

Change-Id: I3488a129741b4ad21a48714294bb54c2ded003db
Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>