alarms: clean up duplicated sounds

another mess...

Alarm_Classic == Oxygen == Cesium
Promethium == Platinum
Argon == Fermium
Nobelium == Neon
Helium == Hassium
Plutonium == Krypton
Neptunium == Carbon

Change-Id: I29330a50a2538a5e3cf3af99d4f7bf1b17de7aca