arm64: dts: imx8mn: Add fspi node

The i.MX8M Nano has the same Flexspi controller used in the i.MX8M
Mini.  Add the node and disable it by default.
Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mn.dtsi

@@ -889,6 +889,19 @@ usdhc3: mmc@30b60000 {
 				status = "disabled";
 			};
 
+			flexspi: spi@30bb0000 {
+				#address-cells = <1>;
+				#size-cells = <0>;
+				compatible = "nxp,imx8mm-fspi";
+				reg = <0x30bb0000 0x10000>, <0x8000000 0x10000000>;
+				reg-names = "fspi_base", "fspi_mmap";
+				interrupts = <GIC_SPI 107 IRQ_TYPE_LEVEL_HIGH>;
+				clocks = <&clk IMX8MN_CLK_QSPI_ROOT>,
+					 <&clk IMX8MN_CLK_QSPI_ROOT>;
+				clock-names = "fspi", "fspi_en";
+				status = "disabled";
+			};
+
 			sdma1: dma-controller@30bd0000 {
 				compatible = "fsl,imx8mn-sdma", "fsl,imx8mq-sdma";
 				reg = <0x30bd0000 0x10000>;