dt-bindings: i2c: maxim,max9286: Use the i2c-mux.yaml schema

Use the i2c-mux.yaml schema in the maxim,max9286 binding schema. With this,
several properties can be dropped as they are defined in i2c-mux.yaml
already.

Cc: Jacopo Mondi <jacopo+renesas@jmondi.org>
Cc: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Cc: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210526184839.2937899-7-robh@kernel.org

Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml

@@ -111,17 +111,10 @@ properties:
 
   i2c-mux:
     type: object
+    $ref: /schemas/i2c/i2c-mux.yaml#
+    unevaluatedProperties: false
     description: |
-      Each GMSL link is modelled as a child bus of an i2c bus
-      multiplexer/switch, in accordance with bindings described in
-      Documentation/devicetree/bindings/i2c/i2c-mux.txt.
-
-    properties:
-      '#address-cells':
-        const: 1
-
-      '#size-cells':
-        const: 0
+      Each GMSL link is modelled as a child bus of an i2c bus multiplexer/switch.
 
     patternProperties:
       "^i2c@[0-3]$":
@@ -133,12 +126,6 @@ properties:
           channels.
 
         properties:
-          '#address-cells':
-            const: 1
-
-          '#size-cells':
-            const: 0
-
           reg:
             description: The index of the GMSL channel.
             maxItems: 1
@@ -173,10 +160,6 @@ properties:
 
             additionalProperties: false
 
-        additionalProperties: false
-
-    additionalProperties: false
-
 required:
   - compatible
   - reg