dt-bindings: net: sun8i-emac: Add A523 EMAC0 compatible

Allwinner A523 SoC variant (A527/T527) contains an "EMAC0" Ethernet
MAC compatible to the A64 version.

Reviewed-by: Andre Przywara <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Yixun Lan <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

Documentation/devicetree/bindings/net/allwinner,sun8i-a83t-emac.yaml

···
               - allwinner,sun20i-d1-emac
               - allwinner,sun50i-h6-emac
               - allwinner,sun50i-h616-emac0
+              - allwinner,sun55i-a523-emac0
           - const: allwinner,sun50i-a64-emac
 
   reg: