perf tools: Switch module.h into export.h

When merged to Linus's latest tree the perf build is broken
due to following change in lib/rbtree.c object:

  lib: reduce the use of module.h wherever possible
  commit 8bc3bcc9


  Author: Paul Gortmaker <paul.gortmaker@windriver.com>
  Date:   Wed Nov 16 21:29:17 2011 -0500

We need to move module.h header into export.h.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: acme@redhat.com
Cc: a.p.zijlstra@chello.nl
Cc: paulus@samba.org
Cc: cjashfor@linux.vnet.ibm.com
Cc: fweisbec@gmail.com
Link: http://lkml.kernel.org/r/1332753425-3299-1-git-send-email-jolsa@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>