Bug: 21588539 Move CHANGE_NETWORK_STATE to be in SYSTEM_SETTINGS

Change the implementation of AppStateAppOpsBridge to handle multiple
requested permissions in one operation due to the merging of
CHANGE_NETWORK_STATE permission with WRITE_SETTINGS.

This change will affect the packages that will be listed under the
"Write system settings" option in Settings->Apps->[Gear/Cog].

Change-Id: I7d2304d2846b6f505a7b1c3fcf53e7a9bd184ed5