ASoC: intel, keembay-i2s: Fix dt binding errors

Fix devicetree binding errors caused by newly added parameters
Signed-off-by: Michael Sit Wei Hong <michael.wei.hong.sit@intel.com>
Link: https://lore.kernel.org/r/20210118102706.6125-1-michael.wei.hong.sit@intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

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

@@ -47,13 +47,11 @@ properties:
 
   dmas:
     items:
-      - description: DMA controller phandle and DMA channel
-                     for TX and RX
+      - description: DMA TX channel
+      - description: DMA RX channel
 
   dma-names:
     items:
-      - description: "tx" for the transmit channel
-                     "rx" for the receive channel
       - const: tx
       - const: rx