dt-bindings: soc: Add new board description for MicroBlaze V

MicroBlaze V is new AMD/Xilinx soft-core 32bit RISC-V processor IP.
It is hardware compatible with classic MicroBlaze processor. Processor can
be used with standard AMD/Xilinx IPs including interrupt controller and
timer.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Michal Simek <michal.simek@amd.com>

Documentation/devicetree/bindings/soc/xilinx/xilinx.yaml

@@ -132,6 +132,11 @@ properties:
           - const: xlnx,zynqmp-smk-k26
           - const: xlnx,zynqmp
 
+      - description: AMD MicroBlaze V (QEMU)
+        items:
+          - const: qemu,mbv
+          - const: amd,mbv
+
 additionalProperties: true
 
 ...