ASoC: Intel: bytcht_es8316: use correct drvdata in snd_byt_cht_es8316_mc_remove()

The snd_byt_cht_es8316_mc_remove() use the platform drvdata as a type
of 'struct byt_cht_es8316_private', but snd_byt_cht_es8316_mc_probe()
set it to 'struct snd_soc_card', as suggested by Dan Carpenter, fix
the usage in snd_byt_cht_es8316_mc_remove().

Fixes: 0d3e91da ("ASoC: Intel: bytcht_es8316: Add external speaker mux support")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mark Brown <broonie@kernel.org>