Include android_filesystem_config.h in mock_bpf_helpers.h am: 2861e3d0f4

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/2017147

Change-Id: I3bc70db4ee73339c8bb97dfe06fc2ba479b90a83
tree: 47f30a6308319bacaa485708aa387aac7626acf5
  1. bpfloader/
  2. libbpf_android/
  3. progs/
  4. Android.bp
  5. NOTICE
  6. OWNERS
  7. OWNERS_bpf
  8. PREUPLOAD.cfg