riscv: dts: sophgo: add initial CV1812H SoC device tree

Add initial device tree for the CV1812H RISC-V SoC by SOPHGO.
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Acked-by: Chen Wang <unicorn_wang@outlook.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

arch/riscv/boot/dts/sophgo/cv1812h.dtsi

+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+/*
+ * Copyright (C) 2023 Inochi Amaoto <inochiama@outlook.com>
+ */
+
+#include <dt-bindings/interrupt-controller/irq.h>
+#include "cv18xx.dtsi"
+
+/ {
+	compatible = "sophgo,cv1812h";
+
+	memory@80000000 {
+		device_type = "memory";
+		reg = <0x80000000 0x10000000>;
+	};
+};
+
+&plic {
+	compatible = "sophgo,cv1812h-plic", "thead,c900-plic";
+};
+
+&clint {
+	compatible = "sophgo,cv1812h-clint", "thead,c900-clint";
+};