lib: s390x: add PSW and PSW_WITH_CUR_MASK macros

Since a lot of code starts new CPUs using the current PSW mask, add two
macros to streamline the creation of generic PSWs and PSWs with the
current program mask.

Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20221130154038.70492-2-imbrenda@linux.ibm.com


Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-Id: <20221130154038.70492-2-imbrenda@linux.ibm.com>