The dev_attrs field of struct class is going away soon, dev_groups
should be used instead.  This converts the led class code to use the
correct field.
Acked-by: NBryan Wu <cooloney@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>