dt-bindings: riscv: add riscv,cbqri bindings

Document properties that can be used in the bindings for controllers
that implement the RISC-V CBQRI specification.

Co-developed-by: Adrien Ricciardi <aricciardi@baylibre.com>
Signed-off-by: Adrien Ricciardi <aricciardi@baylibre.com>
Signed-off-by: Drew Fustini <dfustini@baylibre.com>

Documentation/devicetree/bindings/riscv/riscv,cbqri.yaml

+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/riscv/riscv,cbqri.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: RISC-V Capacity and Bandwidth Register Interface (CBQRI) properties
+
+description: |
+  Common properties for cache and memory controllers that implement the
+  RISC-V CBQRI specification:
+  https://github.com/riscv-non-isa/riscv-cmqri/blob/main/riscv-cbqri.pdf
+
+maintainers:
+  - Drew Fustini <dfustini@baylibre.com>
+
+properties:
+  riscv,cbqri-rcid:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: The maximum number of RCIDs the controller supports
+
+  riscv,cbqri-mcid:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: The maximum number of MCIDs the controller supports
+
+additionalProperties: true
+
+...