dt-bindings: arm: Add Keem Bay bindings

Document Intel Movidius SoC code-named Keem Bay, along with the Keem Bay
EVM board.

Link: https://lore.kernel.org/r/20200717090414.313530-3-daniele.alessandrelli@linux.intel.comReviewed-by: Dinh Nguyen <dinguyen@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Documentation/devicetree/bindings/arm/intel,keembay.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/arm/intel,keembay.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Keem Bay platform device tree bindings
+
+maintainers:
+  - Paul J. Murphy <paul.j.murphy@intel.com>
+  - Daniele Alessandrelli <daniele.alessandrelli@intel.com>
+
+properties:
+  compatible:
+    items:
+      - enum:
+        - intel,keembay-evm
+      - const: intel,keembay
+...