[Telephony] Show 4G icon instead of 3G icon for UMTS network in ATT

Bug: 153624066
Test: make
Change-Id: I2eb97a1210c78d08b86f5616a56219ae3f671010
Merged-In: Idc3f0f645a3c2c653061e6dac546f3469b2bc757
1 file changed