s390/bpf,jit: use generic jit dumper

This is the s390 backend of 79617801 "filter: bpf_jit_comp: refactor
and unify BPF JIT image dump output".

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>