futex: Consolidate duplicated timer setup code

Add a new futex_setup_timer() helper function to consolidate all the
hrtimer_sleeper setup code.

Signed-off-by: Waiman Long <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Darren Hart <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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