ARM: dts: imx6qdl-mba6: don't use multiple blank lines

Avoid the following checkpatch warning:

arch/arm/boot/dts/imx6qdl-mba6.dtsi:247: check: Please don't use
 multiple blank lines

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>