Disable WiFi 'Scan Always' mode (ignore the setting)

This change disables 'Scan Always' by ignoring the setting; and
hard coding value to 'false'. The UI will change based on whatever
is in settings; but underneath we won't enable scans when WiFi is
off.

Change-Id: Ibb1401207b6675e609e979ea23b63177814f762c
Allow ADB to be enabled by default via a config overlay on a per-device basis.
This is useful for developers that are testing and troubleshooting boot issues
and adb ends up being disabled by default once the system kicks in.  This should
only be used for testing and removed once a device is deemed stable and able to
boot.

Change-Id: Ib17d4e10ec68640ce55a91d5b1067d3d37eeec9d

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