Add the OPTi 82c930 audio controller#6502
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Summary
Add the OPTi 82c930 audio controller and give the NEC PowerMate V/BCM FM540 its optional onboard audio.
Known issues: The Windows 95 startup sound stutters when using the drivers from the NEC Ready 7022 preload on a CPU slower than a Pentium 133. Subsequent audio playback does not have issues and the generic drivers from OPTi do not have this issue.
Checklist
References
Provide links to datasheets or other documentation that helped you implement this pull request.
OPTi 82c930 datasheet: https://theretroweb.com/chip/documentation/opti82c930-681c61edcef12277607414.pdf
OPTi MAD16 Linux driver source: https://gitlab.cs.fau.de/sa83dova/linux/-/blob/v2.6.12-rc2/sound/oss/mad16.c
AD1848/WSS Linux driver source: https://gitlab.cs.fau.de/sa83dova/linux/-/blob/v2.6.12-rc2/sound/oss/ad1848.c