bpf: sync tools bpf.h uapi header

Sync the header from include/uapi/linux/bpf.h which was updated to add
fib lookup helper function. This fixes selftests/bpf build failure.

Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>