dt-bindings: sound: add Arm PL041 AACI DT schema

The Arm PrimeCell Advanced Audio CODEC Interface (AACI aka PL041) is
a peripheral that provides communication with an audio CODEC.

Add a simple DT schema binding for it, so that DTs can be validated
automatically.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220506140533.3566431-5-andre.przywara@arm.com

Documentation/devicetree/bindings/sound/arm,pl041.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/arm,pl041.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Arm Ltd. PrimeCell PL041 AACI sound interface
+
+maintainers:
+  - Andre Przywara <andre.przywara@arm.com>
+
+description:
+  The Arm PrimeCell Advanced Audio CODEC Interface (AACI) is an AMBA compliant
+  peripheral that provides communication with an audio CODEC using the AC-link
+  protocol.
+
+# We need a select here so we don't match all nodes with 'arm,primecell'
+select:
+  properties:
+    compatible:
+      contains:
+        const: arm,pl041
+  required:
+    - compatible
+
+properties:
+  compatible:
+    items:
+      - const: arm,pl041
+      - const: arm,primecell
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    description: APB register access clock
+
+  clock-names:
+    const: apb_pclk
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    audio-controller@40000 {
+        compatible = "arm,pl041", "arm,primecell";
+        reg = <0x040000 0x1000>;
+        interrupts = <11>;
+        clocks = <&v2m_clk24mhz>;
+        clock-names = "apb_pclk";
+    };
+
+...