dt-bindings: mips: realtek: Add rtl930x-soc compatible

Add the rtl9302 SoC and the Cameo RTL9302C_2xRTL8224_2XGE reference
board to the list of Realtek compatible strings.

Signed-off-by: Chris Packham <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

Documentation/devicetree/bindings/mips/realtek-rtl.yaml

···
           - enum:
               - cisco,sg220-26
           - const: realtek,rtl8382-soc
+      - items:
+          - enum:
+              - cameo,rtl9302c-2x-rtl8224-2xge
+          - const: realtek,rtl9302-soc
 
 additionalProperties: true