Doze: Introduce a pulse period function.

Instead of pulsing every 30 seconds to mimic the LED, use
a function that pulses more frequently for new notifications,
decaying to a slower pulse, and eventually stopping.

Specifically, the step function for the interval is:
 - 10 seconds for the first minute
 - then 30 seconds until the five minute mark
 - then 60 seconds until the 30 minute mark
 - then no pulsing at all

 - Since we pulse more frequently on new notifications, remove
   the "multi-pulse" concept.
 - Move all doze-related duration parameters to a new helper,
   backed by config, overridable by sysprops, include in dump.
 - Wake up from dozing when hitting volume keys during a pulse.
 -
Bug:17393939
Change-Id: Ica86f08b25c738338fced165c77faf3dfccd0343

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