dt-bindings: soc: microchip: mpfs-sys-controller: Add pic64gx compatibility

pic64gx is not compatible with mpfs because due to the lack of FPGA
functionality some features are disabled. Notably, anything to do with
FPGA fabric contents is not supported.

Signed-off-by: Pierre-Henry Moussay <pierre-henry.moussay@microchip.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>

Author: Pierre-Henry Moussay

Documentation/devicetree/bindings/soc/microchip/microchip,mpfs-sys-controller.yaml

@@ -24,7 +24,9 @@ properties:
     maxItems: 1
 
   compatible:
-    const: microchip,mpfs-sys-controller
+    enum:
+      - microchip,mpfs-sys-controller
+      - microchip,pic64gx-sys-controller
 
   microchip,bitstream-flash:
     $ref: /schemas/types.yaml#/definitions/phandle