Update FFmpeg presets for Rockchip

[MarcA711]

The presets from this PR #9912 caused significantly higher CPU load (especially on smaller socs) and a bug that caused wrong color output (see #9952)

Changes:

• convert frames to yuv420p directly using hardware
• use hwmap (create reference to frame) rather than hwdownload (copy frame)
• disable afbc (afbc is incompatible with yuv420p output; this results in a small performance loss, but overall we gain performance this way)
• allow changing aspect ratio when resizing during decoding

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