ARM: dts: Add support for two more Kontron SoMs N6311 and N6411

The N6311 and the N6411 SoM are similar to the Kontron N6310 SoM.
They are pin-compatible, but feature a larger RAM and NAND flash
(512MiB instead of 256MiB). Further, the N6411 has an i.MX6ULL SoC,
instead of an i.MX6UL.

Signed-off-by: Frieder Schrempf <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

arch/arm/boot/dts/imx6ul-kontron-n6311-som.dtsi

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2017 exceet electronics GmbH
+ * Copyright (C) 2018 Kontron Electronics GmbH
+ */
+
+#include "imx6ul.dtsi"
+#include "imx6ul-kontron-n6x1x-som-common.dtsi"
+
+/ {
+	model = "Kontron N6311 SOM";
+	compatible = "kontron,imx6ul-n6311-som", "fsl,imx6ul";
+
+	memory@80000000 {
+		reg = <0x80000000 0x20000000>;
+		device_type = "memory";
+	};
+};
+
+&qspi {
+	spi-flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "spi-nand";
+		spi-max-frequency = <104000000>;
+		spi-tx-bus-width = <4>;
+		spi-rx-bus-width = <4>;
+		reg = <0>;
+
+		partition@0 {
+			label = "ubi1";
+			reg = <0x00000000 0x08000000>;
+		};
+
+		partition@8000000 {
+			label = "ubi2";
+			reg = <0x08000000 0x18000000>;
+		};
+	};
+};

arch/arm/boot/dts/imx6ull-kontron-n6411-som.dtsi

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2017 exceet electronics GmbH
+ * Copyright (C) 2018 Kontron Electronics GmbH
+ */
+
+#include "imx6ull.dtsi"
+#include "imx6ul-kontron-n6x1x-som-common.dtsi"
+
+/ {
+	model = "Kontron N6411 SOM";
+	compatible = "kontron,imx6ull-n6311-som", "fsl,imx6ull";
+
+	memory@80000000 {
+		reg = <0x80000000 0x20000000>;
+		device_type = "memory";
+	};
+};
+
+&qspi {
+	spi-flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "spi-nand";
+		spi-max-frequency = <104000000>;
+		spi-tx-bus-width = <4>;
+		spi-rx-bus-width = <4>;
+		reg = <0>;
+
+		partition@0 {
+			label = "ubi1";
+			reg = <0x00000000 0x08000000>;
+		};
+
+		partition@8000000 {
+			label = "ubi2";
+			reg = <0x08000000 0x18000000>;
+		};
+	};
+};