dt-bindings: i2c: apple,i2c: Add apple,t6020-i2c compatible

After discussion with the devicetree maintainers we agreed to not extend
lists with the generic compatible "apple,i2c" anymore [1]. Use
"apple,t8103-i2c" as fallback compatible as it is the SoC the driver
and bindings were written for.

This block is compatible with t8103, so just add the new per-SoC
compatible using apple,t8103-i2c as base.

[1]: https://lore.kernel.org/asahi/12ab93b7-1fc2-4ce0-926e-c8141cfe81bf@kernel.org/

Signed-off-by: Janne Grunau <j@jannau.net>
Acked-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>

Documentation/devicetree/bindings/i2c/apple,i2c.yaml

@@ -20,17 +20,22 @@ allOf:
 
 properties:
   compatible:
-    items:
-      - enum:
-          - apple,s5l8960x-i2c
-          - apple,t7000-i2c
-          - apple,s8000-i2c
-          - apple,t8010-i2c
-          - apple,t8015-i2c
-          - apple,t8103-i2c
-          - apple,t8112-i2c
-          - apple,t6000-i2c
-      - const: apple,i2c
+    oneOf:
+      - items:
+          - const: apple,t6020-i2c
+          - const: apple,t8103-i2c
+      - items:
+          - enum:
+              # Do not add additional SoC to this list.
+              - apple,s5l8960x-i2c
+              - apple,t7000-i2c
+              - apple,s8000-i2c
+              - apple,t8010-i2c
+              - apple,t8015-i2c
+              - apple,t8103-i2c
+              - apple,t8112-i2c
+              - apple,t6000-i2c
+          - const: apple,i2c
 
   reg:
     maxItems: 1