Fixed unnecessary network request removal

Telephony network factory used to remove network requests
from both cellular and IWLAN DcTrackers. This causes one extra
network request removal on the new data stack, which is no harm but
generate misleading debug messages.

Fix: 228839789
Test: atest FrameworksTelephonyTests & Manual
Change-Id: Ia9113e92a0f7c84b16fd76970c865513e3e04e7e