dt-bindings: riscv: microchip: document the PIC64GX curiosity kit

Update devicetree bindings document with PIC64GX Curiosity Kit, known
by its "Curiosity-GX1000" product code.

Signed-off-by: Pierre-Henry Moussay <pierre-henry.moussay@microchip.com>
Reviewed-by: Conor Dooley <conor.dooley@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/riscv/microchip.yaml

@@ -4,14 +4,14 @@
 $id: http://devicetree.org/schemas/riscv/microchip.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Microchip PolarFire SoC-based boards
+title: Microchip SoC-based boards
 
 maintainers:
   - Conor Dooley <conor.dooley@microchip.com>
   - Daire McNamara <daire.mcnamara@microchip.com>
 
 description:
-  Microchip PolarFire SoC-based boards
+  Microchip SoC-based boards
 
 properties:
   $nodename:
@@ -46,6 +46,9 @@ properties:
               - microchip,mpfs-sev-kit
               - sundance,polarberry
           - const: microchip,mpfs
+      - items:
+          - const: microchip,pic64gx-curiosity-kit
+          - const: microchip,pic64gx
 
 additionalProperties: true