This fixes the following warning:

arch/arm/boot/dts/imx6sx-udoo-neo.dtsi:309: check: Please don't use multiple
blank lines

While at it, use tabs indent for some pinctrl entries.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>