dt-bindings: sound: intel, keembay-i2s: Add new compatible string

Add a new compatible string that configures the interface to the
desired format.
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/20200811041836.999-3-michael.wei.hong.sit@intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/intel,keembay-i2s.yaml

@@ -17,6 +17,7 @@ properties:
   compatible:
     enum:
       - intel,keembay-i2s
+      - intel,keembay-tdm
 
   "#sound-dai-cells":
     const: 0