ARM: dts: stm32: preset stm32mp15x video #address- and #size-cells

The cell count for address and size is defined by the binding and not
something a board would change. Avoid each board adding this
boilerplate by having the cell size specification in the SoC DTSI.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp151.dtsi

@@ -1423,6 +1423,11 @@ ltdc: display-controller@5a001000 {
 			clock-names = "lcd";
 			resets = <&rcc LTDC_R>;
 			status = "disabled";
+
+			port {
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
 		};
 
 		iwdg2: watchdog@5a002000 {

arch/arm/boot/dts/stm32mp157.dtsi

@@ -24,7 +24,14 @@ dsi: dsi@5a000000 {
 			clock-names = "pclk", "ref", "px_clk";
 			resets = <&rcc DSI_R>;
 			reset-names = "apb";
+			#address-cells = <1>;
+			#size-cells = <0>;
 			status = "disabled";
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+			};
 		};
 	};
 };