ASoC: mt8365: Remove unused prototype for mt8365_afe_clk_group_48k()

The function is not used outside of the file it is defined and the
equivalent function for 44.1kHz is not prototyped so remove the prototype
for this function.
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.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-v1-3-7ad0bac20161@kernel.orgSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/mt8365/mt8365-afe-common.h

@@ -421,7 +421,6 @@ static inline u32 AutoRstThLo(unsigned int fs)
 	}
 }
 
-bool mt8365_afe_clk_group_48k(int sample_rate);
 bool mt8365_afe_rate_supported(unsigned int rate, unsigned int id);
 bool mt8365_afe_channel_supported(unsigned int channel, unsigned int id);