Add a video HAL device to allow BCMVideo to determine which DMA channel it can use for render ops
Detail: hdr/StaticWS, s/Top, s/Video - Added a simple VDU HAL device that exposes a DMA channel to BCMVideo for use with GraphicsV_Render hdr/BCM2835 - Don't allow DMA channel 12 to be used; latest firmware seems to have a bug which claims its free when in reality it isn't. s/Messaging, s/DMA - Adjust DMA init to allow the video device to claim a DMA channel before the DMA devices are initialised Admin: Tested on Raspberry Pi with high processor vectors Version 0.25. Tagged as 'BCM2835-0_25'
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