selftest/bpf: Add setget_sockopt to DENYLIST.s390x

Trampoline is not supported in s390.

Fixes: 31123c0 ("selftests/bpf: bpf_setsockopt tests")
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220819192155.91713-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/DENYLIST.s390x

@@ -65,3 +65,4 @@ send_signal                              # intermittently fails to receive signa
 select_reuseport                         # intermittently fails on new s390x setup
 xdp_synproxy                             # JIT does not support calling kernel function                                (kfunc)
 unpriv_bpf_disabled                      # fentry
+setget_sockopt                           # attach unexpected error: -524                                               (trampoline)