dt-bindings: firmware: versal: add versal-net compatible string

Add dt-binding documentation for Versal NET platforms.
Versal Net is a new AMD/Xilinx SoC.

The SoC and its architecture is based on the Versal ACAP device.
The Versal Net device includes more security features in the
platform management controller (PMC) and increases the number of
CPUs in the application processing unit (APU) and the real-time
processing unit (RPU).
Signed-off-by: Jay Buddhabhatti <jay.buddhabhatti@xilinx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/1705406326-2947516-1-git-send-email-radhey.shyam.pandey@amd.comSigned-off-by: Michal Simek <michal.simek@amd.com>

Documentation/devicetree/bindings/firmware/xilinx/xlnx,zynqmp-firmware.yaml

@@ -26,6 +26,12 @@ properties:
       - description: For implementations complying for Versal.
         const: xlnx,versal-firmware
 
+      - description: For implementations complying for Versal NET.
+        items:
+          - enum:
+              - xlnx,versal-net-firmware
+          - const: xlnx,versal-firmware
+
   method:
     description: |
                  The method of calling the PM-API firmware layer.