s390/sclp: Add SCLP character device driver

Add a character misc device "sclp_ctl" that allows to run SCCBs
from user space using the SCLP_CTL_SCCB ioctl.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --cc Documentation/ioctl/ioctl-number.txt
Simple merge

diff --cc arch/s390/include/uapi/asm/Kbuild
Simple merge

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

diff --cc drivers/s390/char/Makefile
Simple merge

diff --cc drivers/s390/char/sclp.c
Simple merge

diff --cc drivers/s390/char/sclp.h
Simple merge

diff --cc drivers/s390/char/sclp_cmd.c
Simple merge

diff --cc drivers/s390/char/sclp_ctl.c
Simple merge