ARM: dts: r8a7744: Add DU support

Add du node to r8a7744 SoC DT. Boards that want to enable the DU
need to specify the output topology.

Signed-off-by: Biju Das <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Simon Horman <[e-mail]>

arch/arm/boot/dts/r8a7744.dtsi

···
 		};
 
 		du: display@feb00000 {
-			reg = <0 0xfeb00000 0 0x40000>,
-			      <0 0xfeb90000 0 0x1c>;
+			compatible = "renesas,du-r8a7744";
+			reg = <0 0xfeb00000 0 0x40000>;
+			interrupts = <GIC_SPI 256 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 268 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cpg CPG_MOD 724>,
+				 <&cpg CPG_MOD 723>;
+			clock-names = "du.0", "du.1";
+			status = "disabled";
 
 			ports {
 				#address-cells = <1>;
···
 					};
 				};
 			};
-			/* placeholder */
 		};
 
 		prr: chipid@ff000044 {