ASoC: codecs: tx-macro: Drop unimplemented DMIC clock divider

ASoC: codecs: tx-macro: Drop unimplemented DMIC clock divider

Downstream driver configures DMIC clock rate through the divider
register but only parts of this code ended up in the upstream driver: we
always write the same value 0, so DIV2.  Same default value is used also
for the AMIC rate control.

Let's make it obvious and drop unneeded parts of the code.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240202154134.66967-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>