ASoC: qcom: audioreach: Commonize setting channel mappings

Move code assigning channel mapping values to a common helper function.
This simplifies three out of four cases, with the last case using
incompatible type (uint16_t array instead of uint8_t array).

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20231130180758.212172-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Mark Brown <broonie@kernel.org>