dt-bindings: display: adi,adv7533: Drop single lane support

As per [1] and [2], ADV7535/7533 supports only 2-, 3-, or 4-lane. Drop
unsupported 1-lane from bindings.

[1] https://www.analog.com/media/en/technical-documentation/data-sheets/ADV7535.pdf
[2] https://www.analog.com/media/en/technical-documentation/data-sheets/ADV7533.pdf

Fixes: 1e4d58cd7f88 ("drm/bridge: adv7533: Create a MIPI DSI device")
Cc: [e-mail]
Acked-by: Krzysztof Kozlowski <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Reviewed-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Biju Das <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Dmitry Baryshkov <[e-mail]>

Documentation/devicetree/bindings/display/bridge/adi,adv7533.yaml

···
   adi,dsi-lanes:
     description: Number of DSI data lanes connected to the DSI host.
     $ref: /schemas/types.yaml#/definitions/uint32
-    enum: [ 1, 2, 3, 4 ]
+    enum: [ 2, 3, 4 ]
 
   "#sound-dai-cells":
     const: 0