arm64: dts: renesas: r8a77965: Remove non-existent IPMMU-IR

The R-Car Gen3 HardWare Manual Errata for Rev. 1.00 (Aug 24, 2018)
removed the IPMMU-IR IOMMU instance on R-Car M3-N, as this SoC does not
have an Image Processing Unit (IMP-X5) nor the A3IR power domain.

Fixes: 55697cbb ("arm64: dts: renesas: r8a779{65,80,90}: Add IPMMU devices nodes")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm64/boot/dts/renesas/r8a77965.dtsi

@@ -795,14 +795,6 @@ ipmmu_hc: mmu@e6570000 {
 			#iommu-cells = <1>;
 		};
 
-		ipmmu_ir: mmu@ff8b0000 {
-			compatible = "renesas,ipmmu-r8a77965";
-			reg = <0 0xff8b0000 0 0x1000>;
-			renesas,ipmmu-main = <&ipmmu_mm 3>;
-			power-domains = <&sysc R8A77965_PD_A3IR>;
-			#iommu-cells = <1>;
-		};
-
 		ipmmu_mm: mmu@e67b0000 {
 			compatible = "renesas,ipmmu-r8a77965";
 			reg = <0 0xe67b0000 0 0x1000>;