Display Voice nw type if Data nw is Unknown for Sprout.

For multisim device when default data connection is set to 1st sim,
getDataNetworkType() returns Unknown for 2nd sim. In that case use
getVoiceNetworkType() to display Cellular nw type in sim status.

Bug: 18922147
Change-Id: Id7c39f8717737b60bde988cbd1c85ce8f6768a6f
1 file changed