staging: Remove autofs3

autofs3 was moved to staging in 2.6.37, so we can
remove it in the 2.6.39 merge window. If we have
a reason to bring it back after that, this patch
can get reverted.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
About-fscking-timed-by: H. Peter Anvin <hpa@zytor.com>
Cc: Ian Kent <raven@themaw.net>
Cc: autofs@linux.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>