arm: dts: ls1021atwr: Add QSPI node properties

LS1021A-TWR has one micron "n25q128a13" flash of size 16M.
Add QSPI node properties for it.
Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/ls1021a-twr.dts

@@ -242,6 +242,20 @@ &esdhc {
         status = "okay";
 };
 
+&qspi {
+	status = "okay";
+
+	n25q128a130: flash@0 {
+		compatible = "jedec,spi-nor";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		spi-max-frequency = <50000000>;
+		reg = <0>;
+		spi-rx-bus-width = <4>;
+		spi-tx-bus-width = <4>;
+	};
+};
+
 &sai1 {
 	status = "okay";
 };