When constructing packets to DSP, the Audioreach code uses 'struct
audioreach_module_config' to configure parameters like number of
channels, bitrate, sample rate etc, but uses defaults for the channel
mapping.

Rework this code to copy the channel mapping from 'struct
audioreach_module_config', instead of using the default.  This requires
all callers to fill that structure: add missing initialization of
channel mapping.

Entire patch makes code more logical and easier to follow:
1. q6apm-dai and q6apm-lpass-dais code which allocates 'struct
   audioreach_module_config' initializes it fully, so fills both
   the number of channels and the channel mapping.
2. Audioreach code, which uses 'struct audioreach_module_config' when
   constructing packets, copies entire contents of passed config, not
   only pieces of it.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240520-asoc-x1e80100-4-channel-mapping-v4-3-f657159b4aad@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>