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Add general audio support for G&F SAN* platforms

Jonas Höppner requested to merge audio_rework into linux-5.4.23-guf

dts: Add general audio support for G&F SAN* platforms The SANTINO implementation uses the PLL4 audio PLL to generate the 12MHz USB/Audio-codec clock connected to clock out (CKO). For i.MX6QD platforms SANTARO, however, it is not possible to use PLL4 as input clock to generate the necessary 12MHz due to a missing divider (PLL4_AUDIO_DIV). Thus rewrite the clock source to use the 24MHz oscillator directly using the CLKO2 interface.

Also rewrite AUDMUX to configure SS1 connected to AUDMUX3 and SSI2 connected to AUDMUX4. With this it is possible to select the correct configuration in the platform specific code simply by enabling the corresponding SSI and overwriting the &sound label.

BCS 746-000324

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