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
Don't let apps disable the SIM PIN entry screen.

As the user (who controls the app behaviour after all) likely doesn't
see the PIN screen as a lock screen (he likely wants telephony) and the
PIN screen is not shown on a timer-driven basis, it should be treated
specially.

Change-Id: I8d48ab5f097bc926f67eab5835d9b5f1e581db15
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
Don't recreate keyguard for MCC/MNC changes.

Change-Id: I9e5dfdb12df522dc7dd50c26f35aba26b1bbe44e
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>