arch: arm64: dts: bcm2712: For testing only, increase IOMMU space to 4GB

For a test, increase IOMMU IOVA space to 4GB for the ISP-FE/PCIe1
and RP1 (ISP-BE) IOMMUs.

DO NOT MERGE

Signed-off-by: Nick Hollinghurst <nick.hollinghurst@raspberrypi.com>

Author: njhollinghurst

arch/arm64/boot/dts/broadcom/bcm2712-ds.dtsi

@@ -285,6 +285,7 @@
 		compatible = "brcm,bcm2712-iommu";
 		reg = <0x10 0x5100  0x0 0x80>;
 		cache = <&iommuc>;
+		aperture-size = <0x1 0x00000000>; // EXPERIMENTALLY, increase this to 4GB
 		#iommu-cells = <0>;
 	};
 
@@ -303,6 +304,7 @@
 		reg = <0x10 0x5280  0x0 0x80>;
 		cache = <&iommuc>;
 		#iommu-cells = <0>;
+		aperture-size = <0x1 0x00000000>; // EXPERIMENTALLY, increase this to 4GB
 		dma-iova-offset = <0x10 0x00000000>; // HACK for RP1 masters over PCIe
 	};