Properly recognize repeating wakeup alarms

The code in place was inappropriately treating all recurring alarms
as non-wakeup for purposes of deferral.  Worse, it was overriding the
"this deliverable batch of alarms includes a wakeup alarm" bookkeeping,
so could potentially cause inappropriate deferral of even standalone
wakeup alarms.

Bug 18591317

Change-Id: I2a62ed4badcaeb549c1ac4f086014aa829e45427