s390/cpum_cf: move array from header to C file

Move array from header to C file to avoid that it gets defined in
every C file where the header is included:

In file included from arch/s390/kernel/perf_cpum_cf_common.c:19:
./arch/s390/include/asm/cpu_mcf.h:27:18: warning: ‘cpumf_ctr_ctl’ defined but not used [-Wunused-const-variable=]
   27 | static const u64 cpumf_ctr_ctl[CPUMF_CTR_SET_MAX] = {
      |                  ^~~~~~~~~~~~~

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>