ARM: dts: stm32f769-disco: rework ltdc node

With commit f479f5dbb7ac ("ARM: dts: stm32: add ltdc support on
stm32f746 MCU"), which adds the 'ltdc' node in stm32f746.dtsi, we can
simplify stm32f769-disco-uboot.dtsi and align stm32f769-disco.dtsi with
the kernel version.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/arch/arm/dts/stm32f769-disco-u-boot.dtsi b/arch/arm/dts/stm32f769-disco-u-boot.dtsi
index 2c823cc..add55c9 100644
--- a/arch/arm/dts/stm32f769-disco-u-boot.dtsi
+++ b/arch/arm/dts/stm32f769-disco-u-boot.dtsi
@@ -70,22 +70,17 @@
 				};
 			};
 		};
+	};
+};
 
-		ltdc: display-controller@40016800 {
-			compatible = "st,stm32-ltdc";
-			reg = <0x40016800 0x200>;
-			resets = <&rcc STM32F7_APB2_RESET(LTDC)>;
-			clocks = <&rcc 0 STM32F7_APB2_CLOCK(LTDC)>;
-
-			status = "okay";
-			bootph-all;
+&ltdc {
+	clocks = <&rcc 0 STM32F7_APB2_CLOCK(LTDC)>;
+	bootph-all;
 
-			ports {
-				port@0 {
-					dp_out: endpoint {
-						remote-endpoint = <&dsi_in>;
-					};
-				};
+	ports {
+		port@0 {
+			dp_out: endpoint {
+				remote-endpoint = <&dsi_in>;
 			};
 		};
 	};
diff --git a/arch/arm/dts/stm32f769-disco.dts b/arch/arm/dts/stm32f769-disco.dts
index 6f93fc7..d63cd2b 100644
--- a/arch/arm/dts/stm32f769-disco.dts
+++ b/arch/arm/dts/stm32f769-disco.dts
@@ -86,6 +86,10 @@
 	status = "okay";
 };
 
+&ltdc {
+	status = "okay";
+};
+
 &rtc {
 	status = "okay";
 };