SystemUI: reactivate WiFi activity indicators

One of the recent commits (MSIM) removed the wifi service listeners
in NetworkController.java. This commit adds it back again.

Change-Id: I03bea814fac82bfe76a51cde6c29f25887f56e12
Send out USER_PRESENT broadcast on screen on if lockscreen is disabled.

This makes sure to turn off the notification LED on screen on when the
lockscreen is disabled by profile or e.g. by lockscreen toggle tile.

Change-Id: Ibf2fdcd912a2719d973a253aaf3752add7a22e00
FaceUnlock: Check if faceunlock is disabled

JIRA: CYAN-3622
Issue: https://jira.cyanogenmod.org/browse/CYAN-3622

Change-Id: Iaf656f1aecb72610a46183294de25151e8df4b05
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>