Split applyNewState into enable/disable APN

This is the preliminary work for adding handover
type for enable/disable APN.

Test: Telephony sanity tests + unit tests
Bug: 73659459

Merged-In: I5d5ece57555dc2227a306948aa9c79916f79146a
Change-Id: I5d5ece57555dc2227a306948aa9c79916f79146a
(cherry picked from commit fb9f69a6e84938455676bae7413974309bf0fc1b)
4 files changed