This fixes the following dtc warning by removing the unnecessary unit:

Warning (unit_address_vs_reg): Node /onewire@0 has a unit name,
but no reg property
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>