Connectivity metrics: simplify ConnectivityMetricsEvent

Now that ConnectivityMetricsEvent is only used for core networking
metrics and is not @SystemApi anymore, remove unused fields and prepare
for additional new fields.

Test: updated unit tests, $ runtest frameworks-net passes
Bug: 34901696
Change-Id: I15abad19981d491f16f2a3afe401f1e833079907
2 files changed
tree: d079c7ef30a5b969de04306828eb95c376e613d8
  1. core/
  2. services/
  3. tests/