ARM: dts: imx6dl-yapp4: Add Y Soft IOTA Crux/Crux+ board

Add devicetrees for the new boards in the Y Soft IOTA family.
These boards are based on Orion but use Quad/QuadPlus SoC
instead of DualLite.

Signed-off-by: Michal Vokáč <michal.vokac@ysoft.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>