ARM: dts: imx6: Add support for Toradex Apalis iMX6Q/D SoM

Signed-off-by: NMarcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: NPetr Štetiar <ynezz@true.cz>
Reviewed-by: NStefan Agner <stefan@agner.ch>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>