Correct CS4231 indirect register 23 behavior#6195
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Summary
Makes CS4231 indirect register 23 read-only. The datasheet for the CS4231 (non-A, which is what 86Box emulates) marks this as a reserved register and the Linux OSS ad1848.c WSS driver relies on this register being read-only to correctly detect the codec type and set the sample rate for audio playback. This fixes digital audio playback on CS4231-based sound cards (such as the OPTi 929/AcerMagic S20 and Yamaha YMF-701) on Mandrake Linux 8.0 (kernel 2.4.3).
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