ASoC: rt1015: support TDM slot configuration

Add TDM slot callback function to support TDM configuration

Signed-off-by: Shuming Fan <shumingf@realtek.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20201104092005.2227-1-shumingf@realtek.com


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