Reorganize networkstats JNI so it can be included in the connectivity
module.
Bug: 197717846
Test: m
Change-Id: I815ea379f3d9915041c80ac5e743ce62e05f4cf8
Merged-In: I815ea379f3d9915041c80ac5e743ce62e05f4cf8
Have BpfInterfaceMapUpdater to update bpf interface map: adding
the interface and index mapping to bpf interface map when interface
added.
Bug: 215095957
Test: atest FrameworkNetTests
Change-Id: I2189a50c4869cfc0c33fc6f0228f40ee9f3ac1d4