Avoid the following checkpatch warning:

Found possible blank line(s) at end of file
 'arch/arm/boot/dts/imx8mm-venice-gw72xx-0x.dts'
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>