dt-bindings: extcon: siliconmitus,sm5502-muic: document connector

Document recently added connector for SM5502 MUIC:

  qcom/msm8916-samsung-serranove.dtb: extcon@14: 'connector' does not match any of the regexes: 'pinctrl-[0-9]

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

Author: krzk

Documentation/devicetree/bindings/extcon/siliconmitus,sm5502-muic.yaml

@@ -27,6 +27,10 @@ properties:
     description: I2C slave address of the device. Usually 0x25 for SM5502
       and SM5703, 0x14 for SM5504.
 
+  connector:
+    $ref: /schemas/connector/usb-connector.yaml#
+    unevaluatedProperties: false
+
   interrupts:
     maxItems: 1