Staging: w35und: remove hw_data_t typedef

As this typedef is used everywhere in the driver, remove it in a separate
patch.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>