Revert "bpf_progs - remove critical annotation from tether offload program"

This reverts commit 3b61ca66.

Reason for revert: should no longer be needed.

Test: builds
Bug: 150040815
Bug: 159028187
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I660d05643820ca4f107766ed6b277640ea13fbff