Skip roaming-on notification for the same area

Originally when data reg state flickers between home, roaming, out of service, user has to frequently dismiss the notification.
This change only shows notification if the user is roaming using a new
network(new operator numeric) during the radio on time. We'll show
notification for the same area again after user toggles APM.

Fix: 259763304
Test: manually fake roaming with different operatorNumeric and toggle APM.
Test: adb shell am broadcast -a com.android.internal.telephony.TestServiceState --ei phone_id 0 --ei data_roaming_type 2 --es operator a,b,123 --ei voice_reg_state 1
Change-Id: Ib534d54301ba5ef753304736264a206a311364ab
1 file changed