Remove ethernet-service jar dependency.

ethernet service source code is going to be moved into Connectivity
mainline module, and start the ethernet service from the module. The
old ethernet-service lib will be deprecated, remove it from soong
build rule.

Bug: 210586283
Test: m
Change-Id: Iae154ca3462e76b7e0af7172d424f36dece63531
Merged-In: I19d517cac28c18c70b8dad979ecbfe3fb6d26902