perf pfm: Remove duplicate util/cpumap.h include

Fixes: d1f1cecc ("perf list: Check if libpfm4 event is supported")
Reported-by: kernel test robot <yujie.liu@intel.com>
Closes: https://lore.kernel.org/r/202306110636.2sTsiAcl-lkp@intel.com/


Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>