s390: wire up separate socketcalls system calls

As discussed on linux-arch all architectures should wire up the separate
system calls that are hidden behind the socketcall multiplexer system call.

It's just a couple more system calls and gives us a very small performance
improvement.

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

diff --cc arch/s390/include/asm/unistd.h
Simple merge

diff --cc arch/s390/include/uapi/asm/unistd.h
Simple merge

diff --cc arch/s390/kernel/compat_wrapper.c
Simple merge

diff --cc arch/s390/kernel/syscalls.S
Simple merge