arm: dts: stm32: correct stm32mp13-u-boot.dtsi file for STM32MP131

The ltdc reference don't exist for STM32MP131 Soc in STM32MP13x Family,
the &ltdc can't be use in generic U-Boot addon file stm32mp13-u-boot.dtsi

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Change-Id: I4944c4d4e8693c56f6294444400bf6c8e23affdb
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/u-boot/+/346953
Tested-by: Amit MITTAL <amit.mittal@st.com>
Reviewed-by: Sebastien PASDELOUP <sebastien.pasdeloup-ext@st.com>
ACI: CIBUILD <MDG-smet-aci-builds@list.st.com>
Domain-Review: Patrice CHOTARD <patrice.chotard@foss.st.com>
ACI: CITOOLS <MDG-smet-aci-reviews@list.st.com>
Reviewed-by: Amit MITTAL <amit.mittal@st.com>
Reviewed-by: Patrice CHOTARD <patrice.chotard@foss.st.com>

Author: patrickdelaunay

arch/arm/dts/stm32mp13-u-boot.dtsi

@@ -41,6 +41,11 @@
 
 			status = "okay";
 		};
+
+		/* pre-reloc probe = reserve video frame buffer in video_reserve() */
+		display-controller@5a001000 {
+			u-boot,dm-pre-proper;
+		};
 	};
 };
 
@@ -88,11 +93,6 @@
 	u-boot,dm-pre-reloc;
 };
 
-/* pre-reloc probe = reserve video frame buffer in video_reserve() */
-&ltdc {
-	u-boot,dm-pre-proper;
-};
-
 &pinctrl {
 	u-boot,dm-pre-reloc;
 };