PhoneProxy: when using v6 or greater ril make sure current phone type isnt GSM

This fixes an issue with CDMA + LTE devices that are able to utilize
GSM netowrks. When using v6 or greater ril and connected to a GSM network
it routes you through the CDMA stack. This causes all sorts of issues.
Fix by making sure that phone type isnt GSM.

a revert of
f0ddc6a7318b74608c58beca61901820ea7d9a7d
97cabb4543823fd989f4aa371fca41b1aeb07278
a34c63e1842f018f7d318ba7887ec2500c07658c

Change-Id: I4c9fc73e18ebee0df43e69ac982b61904d11333b