clocksource: start CMT at clocksource resume

Add code to start the CMT timer on clocksource resume.  While at it handle
the suspend case as well.  Remove the platform device specific suspend
calls.

This makes sure the timer is started during sysdev_resume().  Without this
patch the clocksource may be read as suspended, this after sysdev resume
but before platform device resume.

Signed-off-by: Magnus Damm <damm@opensource.se>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>