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Support DMA-BUF memory type in buffer queue #41

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Support DMA-BUF memory type in buffer queue #41

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  • Added VB2_DMABUF to vb2_queue.io_modes
  • Set mem_ops to vb2_dma_contig_memops for physically contiguous memory
  • Implemented buf_init() and buf_cleanup() to manage per-buffer state

@liangchingyun
Support DMA-BUF memory type in buffer queue
8d41b00 
- Added VB2_DMABUF to vb2_queue.io_modes
- Set mem_ops to vb2_dma_contig_memops for physically contiguous memory
- Implemented buf_init() and buf_cleanup() to manage per-buffer state
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