Add NetworkOfferCallback to NetworkInterfaceState

The offer is currently not registered, so this won't do anything yet.

Test: atest EthernetServiceTests
Bug: 197548738
Change-Id: Ic0923708619019bb339d1343ff9027a6a670d11c
Merged-In: Ic0923708619019bb339d1343ff9027a6a670d11c
1 file changed