timers: Introduce timerlist infrastructure.

The timerlist infrastructure is a thin layer over the rbtree
code that implements a simple list of timers sorted by an
expires value, and a getnext function that provides a pointer
to the earliest timer.

This infrastructure allows drivers and other kernel infrastructure
to easily implement timers without duplicating code.

Signed-off-by: John Stultz <[email protected]>
LKML Reference: <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
CC: Alessandro Zummo <[email protected]>
CC: Thomas Gleixner <[email protected]>
CC: Richard Cochran <[email protected]>

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