ASoC: hdmi-codec: Fix module unloading caused kernel crash

ASoC: hdmi-codec: Fix module unloading caused kernel crash

The hcp->chmap_info must not be freed up in the hdmi_codec_remove()
function as it leads to kernel crash due ALSA core's
pcm_chmap_ctl_private_free() is trying to free it up again when the card
destroyed via snd_card_free.

Since the driver was converted to devm_snd_soc_register_component() the
whole platform_device.remove can be removed.

Commit cd6111b26280a ("ASoC: hdmi-codec: add channel mapping control")
should not have added the kfree(hcp->chmap_info); to the hdmi_codec_remove
function.

[Separate verison of the fix for -next -- broonie]

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>