dt-bindings: arm: apple: apple,pmgr: Add t8122 compatible

The PMGR blocks on Apple silicon M3 SoCs (t8122) are compatible with the
M1 and M2 predecessors. Add "apple,t8122-pmgr" as M3 specific
compatible.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

Documentation/devicetree/bindings/arm/apple/apple,pmgr.yaml

@@ -36,7 +36,9 @@ properties:
           - const: syscon
           - const: simple-mfd
       - items:
-          - const: apple,t6020-pmgr
+          - enum:
+              - apple,t6020-pmgr
+              - apple,t8122-pmgr
           - const: apple,t8103-pmgr
           - const: syscon
           - const: simple-mfd