d2lte: Modify 'roamingText3' for Network Extender support.

Looks like Verizon Network Extenders use roaming id 3 while connected,
so instead of showing 'Out of Neighborhood', show 'Network Extender' in
phone status.

Change-Id: I938f08d97a922fe8b9d85a163a5e809b6fd513f8
d2lte: remove network_mode.xml

Change-Id: Ibc85449754ad1984ed6b8c6f2b368fd8115d690d
Merge "d2lte: remove network_mode.xml" into kk