ASoC: mt8365: Remove unused DMIC IIR coefficient configuration

ASoC: mt8365: Remove unused DMIC IIR coefficient configuration

Nothing ever calls mt8365_dai_load_dmic_iirc_coeff_table() so the compiler
warns about an unused static function. While it seems likely that something
should be calling the function I don't know what and this is breaking
-Werror builds like allmodconfig so let's just remove it. It can be added
again along with the user.

Reported-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Nathan Chancellor <nathan@kernel.org> # build
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/20240907-asoc-fix-mt8365-build-v1-6-7ad0bac20161@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>