Settings: Add AGPS parameter settings

Add AGPS parameter settings, including preferred
network type, SI mode, AGPS restart type, SUPL
server setting and AGPS switch. All the parameters
can be set and restored to default value.

CRs-Fixed: 507969

Change-Id: Ic2626132f5c6f31d65a86941ffaa8535ce31ce81

Conflicts:
	AndroidManifest.xml
	res/values/bools.xml
	res/values/cm_strings.xml
	src/com/android/settings/location/LocationSettings.java

Conflicts:
	res/values/slim_strings.xml