boards: microchip: sam: add device-tree file for sama7d65_curiosity

Introduce sama7d65_curiosity.dts for sama7d65_curiosity board.

Signed-off-by: Tony Han <tony.han@microchip.com>

Author: TonyHan11

boards/microchip/sam/sama7d65_curiosity/sama7d65_curiosity.dts

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2025 Microchip Technology Inc. and its subsidiaries
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ */
+
+/dts-v1/;
+#include <common/freq.h>
+#include <dt-bindings/mfd/mfd_mchp_sam_flexcom.h>
+#include <dt-bindings/pinctrl/sama7d65-pinctrl.h>
+#include <microchip/sam/sama7d65.dtsi>
+
+/ {
+	model = "SAMA7D65-Curiosity board";
+	compatible = "microchip,sama7d65curiosity", "microchip,sama7d6", "microchip,sama7";
+
+	chosen {
+		zephyr,sram = &ddram;
+		zephyr,console = &uart6;
+		zephyr,shell-uart = &uart6;
+	};
+
+	clocks {
+		main_xtal {
+			clock-frequency = <DT_FREQ_M(24)>;
+		};
+
+		slow_xtal {
+			clock-frequency = <32768>;
+		};
+	};
+
+	ddram: ddram@60000000 {
+		compatible = "ddram";
+		reg = <0x60000000 DT_SIZE_M(1024)>;
+	};
+};
+
+&flx6 {
+	mchp,flexcom-mode = <SAM_FLEXCOM_MODE_USART>;
+	status = "okay";
+
+	uart6: serial@200 {
+		current-speed = <115200>;
+		pinctrl-0 = <&pinctrl_uart6_default>;
+		pinctrl-names = "default";
+		status = "okay";
+	};
+};
+
+&pinctrl {
+	pinctrl_uart6_default: uart6-default {
+		group1 {
+			pinmux = <PIN_PD18__FLEXCOM6_IO0>,
+				 <PIN_PD19__FLEXCOM6_IO1>;
+			bias-disable;
+		};
+	};
+};
+
+&pit64b0 {
+	clock-frequency = <DT_FREQ_M(10)>;
+};