Statsd atom: add packageName to wakeups

Wakeup alarms in batterystats are tracked by both uid and package name.
This is quite unique in batterystats - most things are only tracked by uid.
But, to make sure statsd gets all the same data, statsd now tracks wakeup
alarms' package name too.

Bug: 115686599
Test: UidAtomTests#testWakeupAlarm

Change-Id: I1d124faf207867e0ba70f19d89ff620b73ac5636