ARM: dts: add SKOV imx6q and imx6dl based boards

Add SKOV imx6q/dl LT2, LT6 and mi1010ait-1cp1 boards.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Søren Andersen <san@skov.dk>
Signed-off-by: Juergen Borleis <jbe@pengutronix.de>
Signed-off-by: Ulrich Ölmann <u.oelmann@pengutronix.de>
Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>