s390: decode fadvise64 and fadvise64_64
s390: decode fadvise64 and fadvise64_64

* linux/s390/syscallent.h (fadvise64): Set sys_func.
(fadvise64_64): Set nargs and sys_func.

cuviper/strace,Saruta/strace,cuviper/strace,cuviper/strace,Saruta/strace,Saruta/strace,cuviper/strace,Saruta/strace,Saruta/strace,cuviper/strace