selftests/bpf: Make res_spin_lock AA test condition stronger

Let's make sure that we see a EDEADLK and ETIMEDOUT whenever checking
for the AA tests (in case of simple AA and AA after exhausting 31
entries).

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250410170023.2670683-1-memxor@gmail.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>