dt-bindings: phy: mixel,mipi-dsi-phy: Remove assigned-clock* properties

With dt-schema v2021.02 these properties are added by default. Some SoC
(e.g. imx8mq) configure more than just one clock using these properties.

Fixes: f9b0593 ("dt-bindings: phy: Convert mixel,mipi-dsi-phy to json-schema")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230609071538.149712-1-alexander.stein@ew.tq-group.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: tq-steina

Documentation/devicetree/bindings/phy/mixel,mipi-dsi-phy.yaml

@@ -32,15 +32,6 @@ properties:
   clock-names:
     const: phy_ref
 
-  assigned-clocks:
-    maxItems: 1
-
-  assigned-clock-parents:
-    maxItems: 1
-
-  assigned-clock-rates:
-    maxItems: 1
-
   "#phy-cells":
     const: 0