Doze: Aggressively dial down notification-related pulses.

When dozing and buzz-worthy notifications arrive, don't follow
the LED logic with periodic pulses.

Instead, follow a simple decay schedule after the initial arrival,
 pulsing only at 10s, 30s, 60s, and 120s.

The schedule is reset when a new notification arrives, but only
for the first three times, until either the pickup sensor is
triggered or the device exits doze.

Also:
 - Make the notification trigger configurable.
 - Centralize existing sysprop configuration into DozeParameters.
 - Decouple vibration from debugging, make separately configurable.
 - Remove "delayed" pulse concept, fold into new schedule.

Bug:17496795
Change-Id: I64fc1c862bcfa1c288a4fd91c9d17e3bff245add