s390x: adjust some syscall entries

According to linux/arch/s390/include/uapi/asm/unistd.h, readdir is
defined both on s390 and s390x, while getrlimit, _llseek, sendfile64,
and fadvise64_64 are defined on s390 only.

* linux/s390x/syscallent.h (readdir): Add.
(getrlimit, _llseek, sendfile64, fadvise64_64): Remove.
1 file changed