Properly hook into the struct device groups element. This allows the
core infrastructure to manage the files instead of the bus layer. And
makes the code easier to read.
I didn't clean up the _show functions just modified them a bit to handle
the different args for now and to prevent a build warning.
Signed-off-by: Don Zickus <dzickus@redhat.com> Signed-off-by: Benjamin Romer <benjamin.romer@unisys.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>