Avoid the following checkpatch warning:

arch/arm/boot/dts/imx7d-pico.dtsi:44: error: code indent should use tabs
 where possible
arch/arm/boot/dts/imx7d-pico.dtsi:44: warning: please, no spaces at the
 start of a line
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>