fb: Incoming Call in Background (3/3)

Patch ported from 4.2 which was done by our lovely HCP. A
very popular one so we bring it back and adapt it to 4.4
Allows user to set that Incoming Call UI will remain in background
if screen is on. Instead, a notification is added to StatusBar, which
can be used to bring up the Incoming Call UI. Ringtone and vibration
still occur as per system settings.
This has the same effect as apps marked as "immersive". It prevents
the incoming call from backgrounding the current activity.

Change-Id: I086d5e82cfd54b89489801e8f0f0e2089e77aca5
part 1 of LTE toggle support

Change-Id: I2e1cf08b4a6d49492eec63d4106c857b3905addd
some fixes

Change-Id: Ibd0067418435442d8cff922faf8ef0f6a5a28761