tuna: Disable PhaseBeam wallpaper scrolling

This causes lag on tuna devices, therefore we opt-out

This change is required:
http://review.cyanogenmod.org/#/c/52205/

Change-Id: Ie236ed032a332ee8fff25bd52608462c83f201ef
selinux: Don't reset inherited system-wide configs

Conflicts:
	BoardConfig.mk