hdmi-codec is an optional property.  Ignore to bind TDM DAI link
if the property isn't specified.

Fixes: 5bdbe977 ("ASoC: mediatek: mt8183-da7219: use hdmi-codec")
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20210120092237.1553938-3-tzungbi@google.comSigned-off-by: Mark Brown <broonie@kernel.org>