perf: Per cpu-context rotation timer

Give each cpu-context its own timer so that it is a self contained
entity, this eases the way for per-pmu-per-cpu contexts as well as
provides the basic infrastructure to allow different rotation
times per pmu.

Things to look at:
 - folding the tick and these TICK_NSEC timers
 - separate task context rotation

Signed-off-by: Peter Zijlstra <[email protected]>
Cc: paulus <[email protected]>
Cc: stephane eranian <[email protected]>
Cc: Robert Richter <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Lin Ming <[email protected]>
Cc: Yanmin <[email protected]>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <[email protected]>

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