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v4l2: no need to clean CAPTURE buffer cache

Jeri Li requested to merge jeri.li/gstreamer:no-need-to-clean-v4l2-CAPTURE-buffer-cache into main

By default, v4l2 clean CAPTURE buffer cache which lead dqbuf time consuming about 7~8 millisecond, thus result in poor performance. Set no need clean cache flag when enqueue CAPTURE buffer can promote performance that dqbuf time consuming is less than 1 millisecond.

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