Add ethernet related APIs in prebuilts/sdk.

Add the module-lib and system APIs of ethernet which are moving to
mainline module, This is seen as an API incompatibility as the APIs
are removed from non-updatable APIs, and added to updatable APIs.

Bug: 210586283
Test: m
Test: atest FrameworksNetTests EthernetServiceTests
Change-Id: I70a75aa35da60fad2e42ac98cf542ce5ea77f022
4 files changed