PrivateAddress: Clarify the dependency

The dependency of PrivateAddressCoordinator on Context is too generic.
Actually it just needs the ConnectivityManager#getAllNetworks.

This CL clarifies the dependency and this provides flexibility of
instantiation of the class.

Bug: 369282577

Change-Id: I49043f7f557d83856d54cefc201208b7d9b9dd7f
4 files changed