ebpf tethering - add a map to store data limit, part 2

This is higher level glue code, including dump support.

Tested: builds
Bug: 150736748
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I9777d38d319a0b9db265aa339b7e903c49b8a4df
Merged-In: I9777d38d319a0b9db265aa339b7e903c49b8a4df
3 files changed