perf report: Tidy up reporting of symbols not found

Always printing the level info about if it is in the kernel,
hypervisor or userspace as that is in the hist_entry.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1247325517-12272-1-git-send-email-acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>