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backends/drm: work around the NVidia driver not reporting timestamps better

Xaver Hugl requested to merge work/nvidia-wayland-lag into master

The assumption of t = current time if the driver doesn't report time stamps causes KWin to mis-predict future page flip timing and drop frames. In order to work around that, assume t = current time - 3ms, to calculate in latency caused by event processing.

CCBUG: 409040

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