w1: use default attribute groups for w1 slave devices
As we have 2 sysfs files for the w1 slave devices, let the driver core create / destroy them automatically by setting the default attribute group for them, saving code and housekeeping logic. Acked-by: NEvgeniy Polyakov <zbr@ioremap.net> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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