media: dt-bindings: media: rkisp1: Fix the port description for the parallel interface

The bus-type belongs to the endpoint's properties and should therefore
be moved.

Link: https://lore.kernel.org/r/[e-mail]

Fixes: 6a0eaa25bf36 ("media: dt-bindings: media: rkisp1: Add port for parallel interface")
Signed-off-by: Mehdi Djait <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Signed-off-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

Documentation/devicetree/bindings/media/rockchip-isp1.yaml

···
         description: connection point for input on the parallel interface
 
         properties:
-          bus-type:
-            enum: [5, 6]
-
           endpoint:
             $ref: video-interfaces.yaml#
             unevaluatedProperties: false
 
-        required:
-          - bus-type
+            properties:
+              bus-type:
+                enum: [5, 6]
+
+            required:
+              - bus-type
 
     anyOf:
       - required: