media: videobuf2: Allow exporting of a struct dmabuf
videobuf2 only allowed exporting a dmabuf as a file descriptor,
but there are instances where having the struct dma_buf is
useful within the kernel.
Split the current implementation into two, one step which
exports a struct dma_buf, and the second which converts that
into an fd.
Signed-off-by:
Dave Stevenson <dave.stevenson@raspberrypi.org>
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