ASoC: mediatek: mt8186: remove redundant assignments to variable tdm_con

ASoC: mediatek: mt8186: remove redundant assignments to variable tdm_con

There are two occurrences where variable tdm_con is being initialized
to zero and the next statement re-assigns tdm_con to a new value. The
initializations are redundant and can be removed.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20231023151704.670240-1-colin.i.king@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>