dt-bindings: display: panel: Clean up leadtek,ltk035c5444t properties

Remove common properties listed in common yaml files.
Add required properties needed to describe the panel.

Signed-off-by: John Watts <contact@jookia.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20231210-fs035vg158-v5-5-d75adc75571f@jookia.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231210-fs035vg158-v5-5-d75adc75571f@jookia.org

Documentation/devicetree/bindings/display/panel/leadtek,ltk035c5444t.yaml

@@ -18,16 +18,12 @@ properties:
   compatible:
     const: leadtek,ltk035c5444t
 
-  backlight: true
-  port: true
-  power-supply: true
-  reg: true
-  reset-gpios: true
-
   spi-3wire: true
 
 required:
   - compatible
+  - reg
+  - port
   - power-supply
   - reset-gpios