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
f0ddc6a7
97cabb45
a34c63e1

Change-Id: I4c9fc73e18ebee0df43e69ac982b61904d11333b