dt-bindings: display: bridge: lvds-codec: Document power-supply property

Document optional power-supply property that may be used to specify the
regulator powering up the device.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

Documentation/devicetree/bindings/display/bridge/lvds-codec.yaml

@@ -79,6 +79,9 @@ properties:
       The GPIO used to control the power down line of this device.
     maxItems: 1
 
+  power-supply:
+    maxItems: 1
+
 required:
   - compatible
   - ports