NetworkTypeController listen directly to setPreferredNetworkType

Listening to the settings change sometimes does not trigger the
preferred network type changed event. Create a listener for
NetworkTypeController to listen directly to when
setPreferredNetworkTypes is called.

Test: atest NetworkTypeControllerTest
Bug: 157859849
Change-Id: I66fba85b7e3d5f0e6c7cd2f08a11d4422c9be281