ASoC: codec: tlv3204: Increased maximum supported channels

Increased maximum supported channel to 8 channels for audio capture
running in TDM mode.

Signed-off-by: Michael Sit Wei Hong <michael.wei.hong.sit@intel.com>
Reviewed-by: Sia Jee Heng <jee.heng.sia@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200812094631.4698-3-michael.wei.hong.sit@intel.com


Signed-off-by: Mark Brown <broonie@kernel.org>