dt-bindings: rtc: sun6i: Add Allwinner A523 support

The RTC in the Allwinner A523 SoC is compatible to the D1 and R329, so
just add its name and use the R329 as a fallback.

Signed-off-by: Andre Przywara <[email protected]>
Acked-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexandre Belloni <[email protected]>

Author: Andre-ARM

Documentation/devicetree/bindings/rtc/allwinner,sun6i-a31-rtc.yaml

@@ -30,7 +30,9 @@ properties:
           - const: allwinner,sun50i-a64-rtc
           - const: allwinner,sun8i-h3-rtc
       - items:
-          - const: allwinner,sun20i-d1-rtc
+          - enum:
+              - allwinner,sun20i-d1-rtc
+              - allwinner,sun55i-a523-rtc
           - const: allwinner,sun50i-r329-rtc
 
   reg: