[S390] cio: inline assembly cleanup

Fix incorrect in- and output constraints, remove volatile declaration
of inline assembly parameters and reformat constraint declarations to
be more consistent.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --cc drivers/s390/cio/cio.c
Simple merge

diff --cc drivers/s390/cio/io_sch.h
Simple merge

diff --cc drivers/s390/cio/ioasm.h
Simple merge