LegacyState does not send notifyDisplayInfoChanged

1. LegacyState add the updateOverrideNetworkType
when EVENT_DATA_RAT_CHANGED
2. TelephonyTester add operator_raw case

Bug: 156463826
Test: adb shell am broadcast -a \
com.android.internal.telephony.TestServiceState --ei \
data_rat 14 --ei nr_state 0 --ei nr_frequency_range 0 --es operator_raw\
 "AT\&T\\.\\.\\.1"

Change-Id: Ife70786f426a884a3d935b509ebc9f75377c00bc