[PATCH] SMP fix for 6pack driver

Drivers really only work well in SMP if they actually can be selected.
This is a leftover from the time when the 6pack drive only used to be
a bitrotten variant of the slip driver.

Signed-off-by: Ralf Baechle DL5RB <ralf@linux-mips.org>
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>