Add atv device repo to cm-12.1 default manifest
Add atv device repo to cm-12.1 default manifest

Change-Id: Ibf0ed2c27ee274851918b65206e0496eae2aa939

fallouttester/platform_manifest,knone1/platform_manifest,hagar006/platform_manifest,ND-3500/platform_manifest,pranav01/platform_manifest,RR-msm7x30/platform_manifest,Hybrid-Power/startsync