iommu: bcm2712-iommu: Add locking; fix address offset; tidy#6939

pelwell merged 1 commit intoraspberrypi:rpi-6.12.yraspberrypi/linux:rpi-6.12.yfrom

njhollinghurst:iommu_20250704njhollinghurst/linux:iommu_20250704Copy head branch name to clipboard