[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