s390/ptrace: make all psw related defines also available for asm

Use the _AC() macro to make all psw related defines also available for
assembler files.

Acked-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>