[Buildroot] Audio drivers for Orange PI Zero on 4.15

[Riccardo Raneri]

 Does sound work on kernel 4.15 or it's mandatory to switch to a previous
version?

My Orange PI Zero doesn't see any soundcard, even if I enabled alsactl,
alsautil and the device drivers for Allwinner SOCs:

 <*> Allwinner A10 Codec Support
Allwinner SUN8I audio codec
Allwinner sun8i Codec Analog Controls Support
Allwinner A10 I2S Support
Allwinner A10 SPDIF Support

Thanks,
Riccardo
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