[NETD-BPF#10] Add WaitForProgsLoaded.h am: 5b0fbc192e am: 0f9e8af368

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/1869328

Change-Id: Iaa6620f85e16322fe5fc59cbeaed6c766c5be4ff
tree: 0a092a05916d23f3deeaeb998e4ab1c0bcb980d9
  1. bpfloader/
  2. libbpf_android/
  3. progs/
  4. Android.bp
  5. NOTICE
  6. OWNERS
  7. OWNERS_bpf
  8. PREUPLOAD.cfg