Updating Eth Update Request to use Builder

Updating EthernetNetworkUpdateRequest to use a builder for
creation and also changing to use IpConfiguration instead of
StaticIpConfiguration.

Bug: 220017952
Bug: 210487893
Bug: 210485380
Test: atest EthernetServiceTests
Change-Id: I78b002c12cf927c075671b75f0fe0d7878443b56
2 files changed