TetherController - remove unused mBpfDownstream64Map

We don't yet have any users of this (even the bpf programs don't yet use it).
Either way it should be handled by the tethering mainline module.

Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Icef831e18acdf024251d992037b0d33b20c5c8ab
2 files changed