Address API review feedback, other APIs have been refering to these as "interface" instead of "iface" so migrate the APIs named *Iface* to *Interface*. (cherry-picked from ag/14326779) Bug: 183972554 Test: atest android.net.UnderlyingNetworkInfoTest Merged-In: I38b476e762fb57fa88c4a789092d0af6f5330d80 Change-Id: I38b476e762fb57fa88c4a789092d0af6f5330d80