s390/cpumf: add new extended counter set for IBM z16

Export the extended counter set counters of the IBM z16 via sysfs.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>