Use clearAll() of NetworkCapabilities.Builder instead am: 1345717eec am: 2b197c94df am: a120792c25

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/1644468

Change-Id: I5568ee3c1ead76a1ea574b44a27117f100946014
tree: 3bf9c04249d32604894013eeb9d6cc42f7a9eb8b
  1. service-t/
  2. tests/