overlay: enable multiuser ui

This is disabled on low RAM devices by default. Needs some
magic in the framework (http://review.cyanogenmod.org/#/c/78423/)
or switching the low_ram prop.

Change-Id: Ibaaa04b5f30d03b2f4f6dd0e679390ced92a78fe
remove redundant wifi flags

Change-Id: Ie61ae18896f4fae0442790be8cfac77c6d63a06f