arm64: dts: renesas: r8a774c0: Fix register range of display node

Since the R8A774C0 SoC uses DU{0,1} only, the register block length
should be 0x40000.

Based on commit 06585ed3 ("arm64: dts: renesas: r8a77990: Fix
register range of display node") for R-Car E3.

Fixes: 8ed3a6b2 ("arm64: dts: renesas: r8a774c0: Add display output support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a774c0.dtsi

@@ -1805,7 +1805,7 @@ csi40vin5: endpoint@1 {
 
 		du: display@feb00000 {
 			compatible = "renesas,du-r8a774c0";
-			reg = <0 0xfeb00000 0 0x80000>;
+			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>,