tuna: use CM default overlays

This is CyanogenMod so we no longer need an ICS wallpaper,
PhaseBeam as default wallpaper and a short period of time
to screen off.

Change-Id: Ib5b53c93dbaa330252ffafd74ef74abec9570e91
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_device_samsung_tuna into cd-4.4