Report anomaly for radio power failures

RIL.java will respond RADIO_NOT_AVAILABLE to unresponded requests. It
will result in false alarm to this feature. So we don't trigger
bugreport for RadioError.RADIO_NOT_AVAILABLE.

Bug: 172808851
Test: simulate radio power failure and check connectivity monitor log
Change-Id: I5b4981099e1f3558337fe7d5b5c485365dcd5ada
Merged-In: I5b4981099e1f3558337fe7d5b5c485365dcd5ada