bpf loader improvements for better long term compatibility with mainline am: 355b8df7f5

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/bpf/+/15187416

Change-Id: I6dc10e91173826c7958ed21009288e64e14f416b
tree: c1102b1a7de886f80131a642c6b3cf7501ecefe0
  1. bpfloader/
  2. libbpf_android/
  3. progs/
  4. Android.bp
  5. NOTICE
  6. OWNERS
  7. PREUPLOAD.cfg