dt-bindings: fsi: ibm,p9-scom: Add "ibm,fsi2pib" compatible

The "ibm,fsi2pib" compatible was originally in the binding, but it
changed to "ibm,p9-scom" in the end. However, both compatibles are in
use, so just support both.

Signed-off-by: "Rob Herring (Arm)" <robh@kernel.org>
Link: https://lore.kernel.org/r/20250307230822.832936-1-robh@kernel.org
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

Author: robherring

Documentation/devicetree/bindings/fsi/ibm,p9-scom.yaml

@@ -16,6 +16,7 @@ description:
 properties:
   compatible:
     enum:
+      - ibm,fsi2pib
       - ibm,p9-scom
       - ibm,i2cr-scom