dt-bindings: display: rockchip-dw-mipi-dsi: Document rv1126 DSI

Document the MIPI DSI for Rockchip RV1126, which is
different from other SoCs variants.

Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230731110012.2913742-8-jagan@edgeble.ai

Documentation/devicetree/bindings/display/rockchip/rockchip,dw-mipi-dsi.yaml

@@ -18,6 +18,7 @@ properties:
           - rockchip,rk3288-mipi-dsi
           - rockchip,rk3399-mipi-dsi
           - rockchip,rk3568-mipi-dsi
+          - rockchip,rv1126-mipi-dsi
       - const: snps,dw-mipi-dsi
 
   interrupts:
@@ -77,6 +78,7 @@ allOf:
             enum:
               - rockchip,px30-mipi-dsi
               - rockchip,rk3568-mipi-dsi
+              - rockchip,rv1126-mipi-dsi
 
     then:
       properties: