[PATCH] Add modalias to macio sysfs attributes

Provide a "compatible" entry in /sys/bus/macio/devices/*/ This can be used
to load drivers via the modules.alias file.

Signed-off-by: Olaf Hering <olh@suse.de>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>