boards: nios2: qemu: Enable device support for qemu

Add device tree support for qemu

Signed-off-by: Savinay Dharmappa <savinay.dharmappa@intel.com>

boards/nios2/qemu_nios2/Kconfig.board

@@ -3,3 +3,4 @@ config BOARD_QEMU_NIOS2
 	bool "QEMU NIOS II target"
 	depends on SOC_NIOS2_QEMU
 	select QEMU_TARGET
+	select HAS_DTS

boards/nios2/qemu_nios2/qemu_nios2.dts

@@ -0,0 +1,23 @@
+/dts-v1/;
+
+#include <nios2-qemu.dtsi>
+
+/ {
+	model = "qemu_nios2";
+	compatible = "qemu,nios2";
+
+	aliases {
+		uart_0 = &uart0;
+	};
+
+	chosen {
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+		zephyr,console = &uart0;
+	};
+};
+
+&uart0 {
+	status = "ok";
+	current-speed = <115200>;
+};