dt-bindings: i2c: i2c-imx-lpi2c: add dmas property

i.MX LPI2C has dma capability, so add dmas property
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

Documentation/devicetree/bindings/i2c/i2c-imx-lpi2c.yaml

@@ -44,6 +44,16 @@ properties:
   clocks:
     maxItems: 2
 
+  dmas:
+    items:
+      - description: DMA controller phandle and request line for TX
+      - description: DMA controller phandle and request line for RX
+
+  dma-names:
+    items:
+      - const: tx
+      - const: rx
+
   power-domains:
     maxItems: 1