s390/facilities: add z13 als bit

If configured for z13 assume the kernel makes use of the instructions
that are part of the load-and-zero-rightmost-byte facility and
load/store-on-condition facility 2.

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