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v4l2videodec: Increase internal bitstream pool size

This patch will now set the maximum of buffers to 32, allowing to grow the pool for drivers that supports that and will respect the minimum buffers reported by the driver. This was made to fix a stall with the virtio CODEC driver.

Fixes #672 (closed)

(FOR BACKPORT: manual intervention will be needed as the MIN_BUFFERS macro did not take a v4l2 object in parameter, that was added to support alternate fields interlacing).

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