Partially implement sceAudiocodec #20199
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Followup to #20196
This implementation is buggy and incomplete, but lets a few games (including GTA: VCS, but it's unstable) work a bit and play Atrac3+ audio with our HLE sceAtrac implementation disabled - instead an sceAtrac implementation shipped on disc is loaded and used, which talks to sceAudiocodec to do the actual work.
This is not really generally usable since a lot of games load sceAtrac from firmware using sceUtilityLoadModule, so there's no code for us to load. But it's an interesting experiment, and this might become useful later for sceMpeg emulation purposes.
Also removes the Code Lyoko hack, no longer needed.