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Add support to simple-dmabuf-v4l for NV12 devices that combine planes in a dmabuf.

Bram Stolk requested to merge stolk/weston:single-buf-nv12 into main

There are V4L2 devices that will output NV12 but will do so using one dma buffer. To support this, we need to add the same dma buffer twice but with a different offset for the chrominance plane.

Fixes wayland/weson#712 Signed-off-by: Bram Stolk (b.stolk@gmail.com)

Edited by Bram Stolk

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