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.

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Reviewed-by: Joshua Peisach <jpeisach@ubuntu.com>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Janne Grunau <j@jannau.net>
Link: https://patch.msgid.link/20260505-apple-m3-initial-devicetrees-v2-1-b0c2f3519e0e@jannau.net
Signed-off-by: Sven Peter <sven@kernel.org>

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