bpf: Change 'BPF_ADD' to 'BPF_AND' in print_bpf_insn()

This 'BPF_ADD' is duplicated, and I belive it should be 'BPF_AND'.

Fixes: 981f94c3 ("bpf: Add bitwise atomic instructions")
Signed-off-by: Menglong Dong <dong.menglong@zte.com.cn>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Brendan Jackman <jackmanb@google.com>
Link: https://lore.kernel.org/bpf/20210127022507.23674-1-dong.menglong@zte.com.cn