h264decoder: Update latency dynamically

Seungha Yang requested to merge seungha.yang/gstreamer:h264dec-dyn-latency into main

The actual number of reorder frames is unknown unless frame reordering is disabled (e.g., POC type 2 or constrained-* profiles). Also derived maximum DPB size or max_num_reorder_frames in VUI is not the upper bound of output delay.

Fixes: #2702 (closed)

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