bcm2835-dma: Add proper 40-bit DMA support
raspberrypi inclusion category: feature bugzilla: 50432 -------------------------------- BCM2711 has 4 DMA channels with a 40-bit address range, allowing them to access the full 4GB of memory on a Pi 4. Signed-off-by: NPhil Elwell <phil@raspberrypi.org> Signed-off-by: NFang Yafen <yafen@iscas.ac.cn> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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