bpf_progs - offload - fallback to stub on unpatched [4.14,5.4) kernels am: b49f8b7ccf am: 8c96c9f0be

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/netd/+/11905119

Change-Id: Ib2e0d34787876cc94ca82fde2ca5cd5fd91cb8c9