ARM: sched_clock: Return suspended count earlier

If we're suspended and sched_clock() is called we're going to
read the hardware one more time and throw away that value and
return back the cached value we saved during the suspend
callback. This is wasteful. Let's short circuit all that and
return the cached value as early as possible if we're suspended.

Acked-by: Will Deacon <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Signed-off-by: John Stultz <[email protected]>

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