ARM: dts: vf610-twr: indent use tabs, no spaces at start of line

Avoid the following checkpatch warning:

arch/arm/boot/dts/vf610-twr.dts:172: 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>