time: sched_clock: record cycle count in suspend and resume

Record cycle count and kernel time in ns while entering suspend
and while resuming. This will help in matching up the kernel time
with external subsystems and in recording suspend time in cycles.

Change-Id: If22d9880103c7d54087d0faf4c992259e6b97f08
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>