bpf_headers: add bpf_printf() helper macro am: 2a8bf65973 am: 2370758f6a

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3249699

Change-Id: I3e35f50a05689d20998a5dcd9d50b08fab700c00
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>