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backends/drm: set dma-fence deadlines if available

Xaver Hugl requested to merge work/zamundaaa/dma-fence-deadline into master

This tells the kernel when a buffer should be done rendering, which allows it to for example increase GPU clocks in order to hopefully hit our deadlines. That in turn should reduce the amount of dropped frames

Draft because the uAPI isn't actually merged to the kernel yet. See for the needed patches

CCBUG: 452119

cc #124 (closed)

Edited by Xaver Hugl

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