m7: Make the ringtone properly repeat

The radio only sends one ring, causing the ringtone to
only play once.

Change-Id: Id2575feb075ccec0d53d3466e8112a1b8da2a34c
Merge "m7: Make the ringtone properly repeat" into cm-10.1
Merge pull request #25 from CyanogenMod/cm-10.1

Cm 10.1