dt-bindings: fpga: Add binding doc for versal fpga manager

This patch adds binding doc for versal fpga manager driver.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
Signed-off-by: Appana Durga Kedareswara rao <appana.durga.rao@xilinx.com>
Link: https://lore.kernel.org/r/20210626155248.5004-3-nava.manne@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/fpga/xlnx,versal-fpga.yaml

@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/fpga/xlnx,versal-fpga.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xilinx Versal FPGA driver.
+
+maintainers:
+  - Nava kishore Manne <nava.manne@xilinx.com>
+
+description: |
+  Device Tree Versal FPGA bindings for the Versal SoC, controlled
+  using firmware interface.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - xlnx,versal-fpga
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    versal_fpga: versal_fpga {
+         compatible = "xlnx,versal-fpga";
+    };
+
+...