ARM: dts: stm32: Add new stm32f469 dtsi file with mipi dsi

In the stm32f4 family, mipi dsi is only supported on stm32f469.
So add a new stm32f469 dtsi file & add mipi dsi support inside.
Signed-off-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32f469.dtsi

+/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
+/* Copyright (C) STMicroelectronics 2017 - All Rights Reserved */
+
+#include "stm32f429.dtsi"
+
+/ {
+	soc {
+		dsi: dsi@40016c00 {
+			compatible = "st,stm32-dsi";
+			reg = <0x40016c00 0x800>;
+			interrupts = <92>;
+			resets = <&rcc STM32F4_APB2_RESET(DSI)>;
+			reset-names = "apb";
+			clocks = <&rcc 1 CLK_F469_DSI>, <&clk_hse>;
+			clock-names = "pclk", "ref";
+			status = "disabled";
+		};
+	};
+};