Allow setting a per-device default configuration for STATUS_BAR_BATTERY

Batteryless devices (like TV-connected mediacenters/STBs) don't need
the battery icon there at all.

Change-Id: Iac7e1b0b813c260bc78f4733409a30da7bda248d

Conflicts:
	packages/SettingsProvider/res/values/defaults.xml
telephony: set additional audioparameters for incall audio (1/2)

Change-Id: Icbf02a80f170559ad4a5d160ed254cbe81704df6

Conflicts:
	core/res/res/values/symbols.xml

Conflicts:
	core/res/res/values/symbols.xml