This is the preliminary work for adding handover
type for enable/disable APN.
Test: Telephony sanity tests + unit tests
Bug: 73659459
Merged-In: I51fd01d798cdf8d04fd41455126d017ac97f5f3f
Change-Id: I51fd01d798cdf8d04fd41455126d017ac97f5f3f
(cherry picked from commit ade6d1a66d)