dt-bindings: display: renesas: du: Add vendor prefix to vsps property

The Renesas-specific "vsps" property lacks a vendor prefix.
Add a "renesas," prefix to comply with DT best practises.

Move "renesas,vsps" below "renesas,cmms" to preserve alphabetical sort
order.

Fixes: 06711e6385a4ab4c ("drm: rcar-du: Document the vsps property in the DT bindings")
Signed-off-by: Geert Uytterhoeven <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Laurent Pinchart <[e-mail]>

Documentation/devicetree/bindings/display/renesas,du.txt

···
       supplied they must be named "dclkin.x" with "x" being the input clock
       numerical index.
 
-  - vsps: A list of phandle and channel index tuples to the VSPs that handle
-    the memory interfaces for the DU channels. The phandle identifies the VSP
-    instance that serves the DU channel, and the channel index identifies the
-    LIF instance in that VSP.
-
   - renesas,cmms: A list of phandles to the CMM instances present in the SoC,
     one for each available DU channel. The property shall not be specified for
     SoCs that do not provide any CMM (such as V3M and V3H).
+
+  - renesas,vsps: A list of phandle and channel index tuples to the VSPs that
+    handle the memory interfaces for the DU channels. The phandle identifies the
+    VSP instance that serves the DU channel, and the channel index identifies
+    the LIF instance in that VSP.
 
 Required nodes:
 
···
 			 <&cpg CPG_MOD 722>,
 			 <&cpg CPG_MOD 721>;
 		clock-names = "du.0", "du.1", "du.2", "du.3";
-		vsps = <&vspd0 0>, <&vspd1 0>, <&vspd2 0>, <&vspd0 1>;
 		renesas,cmms = <&cmm0>, <&cmm1>, <&cmm2>, <&cmm3>;
+		renesas,vsps = <&vspd0 0>, <&vspd1 0>, <&vspd2 0>, <&vspd0 1>;
 
 		ports {
 			#address-cells = <1>;