Settings: add ACTION_NETWORK_PROVIDER_SETTINGS

This CL adds ACTION_NETWORK_PROVIDER_SETTINGS so Settings app and
SystemUI can make use of this resource without defining locally each
time.

Flag: None
Bug: None
Test: atest -c SystemUITests:InternetDialogControllerTest
Change-Id: If440ca1caebf25648e6774a46ca6ed9b6be476eb