Run bpf_existence_test in presubmit.

This has been green for a while. On S:

https://android-build.googleplex.com/builds/tests/view?invocationId=I42200010019333308&testResultId=TR79227903031586436

On R:
https://android-build.googleplex.com/builds/tests/view?invocationId=I28900010019347533&testResultId=TR73127903058200457

Test: treehugger
Change-Id: Iece7be238e069c7a71f150893a0f6cc155e7b09b
1 file changed