dt-bindings: restrict properties for sitronix,st7735r

David Lechner noticed (paraphrased):
- not all properties from panel-common are applicable.
- missing optional rotation and backlight properties

Fix this by listing all allowed properties,
and do not allow other properties.

Fixes: abdd9e3705c8 ("dt-bindings: display: sitronix,st7735r: Convert to DT schema")
Reported-by: David Lechner <[e-mail]>
Signed-off-by: Sam Ravnborg <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Cc: David Lechner <[e-mail]>
Cc: [e-mail]
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

Documentation/devicetree/bindings/display/sitronix,st7735r.yaml

···
     maxItems: 1
     description: Display data/command selection (D/CX)
 
+  backlight: true
+  reg: true
+  reset-gpios: true
+  rotation: true
+
 required:
   - compatible
   - reg
   - dc-gpios
   - reset-gpios
+
+additionalProperties: false
 
 examples:
   - |