Wifi: Add a feature to control wifi auto connect.

If wifi connection type and gsm to wifi connection type is auto connect,
auto connect wifi.
CRs-Fixed: 507965

Change-Id: Icbfc58c93f13e97a2b6c6526d154153031e4b77c

Conflicts:
	core/res/res/values/symbols.xml
	wifi/java/android/net/wifi/WifiStateMachine.java

Conflicts:
	core/java/android/provider/Settings.java

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

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

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

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