sched/clock: Use static key for sched_clock_running

sched_clock_running may be read every time sched_clock_cpu() is called.
Yet, this variable is updated only twice during boot, and never changes
again, therefore it is better to make it a static key.

Signed-off-by: Pavel Tatashin <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Cc: [email protected]
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Cc: [email protected]
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Cc: [email protected]
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Link: https://lkml.kernel.org/r/[email protected]

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