w1: ds2482: Add i2c module alias name

Add i2c alias to enable autoloading of the module for device specified
in device-tree.

Signed-off-by: Ludek Hlavacek <ludek_h@seznam.cz>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>