rapidio: convert bus code to use bus_groups

The bus_attrs field of struct bus_type is going away soon, dev_groups
should be used instead.  This converts the rapidio bus code to use the
correct field.

Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Alexandre Bounine <alexandre.bounine@idt.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/rapidio/rio-driver.c
Simple merge

diff --cc drivers/rapidio/rio-sysfs.c
Simple merge

diff --cc drivers/rapidio/rio.h
Simple merge