Don't copy the same alarm ring tone repeatedly

(1) Oxygen.ogg Cesium.ogg Alarm_Classic.ogg are identical
(2) Hassium.ogg Helium.ogg are identical
(3) Platinum.ogg Promethium.ogg are identical
(4) Fermium.ogg Argon.ogg are identical
(5) Nobelium.ogg Neon.ogg are identical
So remove duplicate and retain one

Change-Id: I1004a809606f470332bad0e372fb329e912e4943
CRs-Fixed: 1022235