ASoC: dt-bindings: support imx95's CM7 core

Add binding for imx95's CM7 core, used for audio processing.
Additionally, introduce a common binding for NXP audio processors with
Sound Open Firmware (SOF) support.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Link: https://patch.msgid.link/20250311163255.2664-2-laurentiumihalcea111@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/fsl,sof-cpu.yaml

@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sound/fsl,sof-cpu.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP audio processor common properties
+
+maintainers:
+  - Daniel Baluta <daniel.baluta@nxp.com>
+
+properties:
+  mboxes:
+    maxItems: 4
+
+  mbox-names:
+    items:
+      - const: txdb0
+      - const: txdb1
+      - const: rxdb0
+      - const: rxdb1
+
+required:
+  - mboxes
+  - mbox-names
+
+additionalProperties: true