time: sched_clock: record cycle count in suspend and resume

Record cycle count and kernel time in nano-seconds 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>