arm64: dts: mnt-reform2: don't use multiple blank lines

Avoid the following checkpatch warning:

arch/arm/boot/dts/imx8mq-mnt-reform2.dts:213: check: Please don't use
 multiple blank lines

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Lucas Stach <dev@lynxeye.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>