Migrated codes to the new package

TelephonyNetworkFactor and CellularDataService are used by
the new data stack. Moved to the new package before completely
removing com.android.internal.telephony.dataconnection.

Bug: 196597630
Test: atest FrameworksTelephonyTests
Change-Id: I8fed882f180f8e418b7feab980ac00d9d22eca58