Adding sysfs object to provide sysfs mount information in the same way
as debugfs object does.

The object provides following function:
sysfs_find_mountpoint

which returns the sysfs mount mount.

Cc: Corey Ashford
Cc: Ingo Molnar
Cc: Paul Mackerras
Cc: Peter Zijlstra
Link: http://lkml.kernel.org/r/1327674868-10486-4-git-send-email-jolsa@redhat.com
Signed-off-by: Jiri Olsa
Signed-off-by: Arnaldo Carvalho de Melo