dt-bindings: media: st,stmipid02: correct lane-polarities maxItems

The MIPID02 can use up to 2 data lanes which leads to having a maximum
item number of 3 for the lane-polarities since this also contains the
clock lane.

CC: [e-mail]
Fixes: c2741cbe7f8a ("dt-bindings: media: st,stmipid02: Convert the text bindings to YAML")
Signed-off-by: Alain Volmat <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

Documentation/devicetree/bindings/media/i2c/st,st-mipid02.yaml

···
                 description:
                   Any lane can be inverted or not.
                 minItems: 1
-                maxItems: 2
+                maxItems: 3
 
             required:
               - data-lanes