perf/x86/rapl: Fix missing psys sysfs attributes

This fixes a problem introduced by commit:

  5fb5273a ("perf/x86/rapl: Use new MSR detection interface")

that perf event sysfs attributes for psys RAPL domain are missing.

Fixes: 5fb5273a ("perf/x86/rapl: Use new MSR detection interface")
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Reviewed-by: Len Brown <len.brown@intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20200811153149.12242-2-rui.zhang@intel.com