ASoC: dt-bindings: microchip,pdmc: add 'sound-name-prefix' property

Add 'sound-name-prefix' property to differentiante between interfaces in
DPCM (ASRC) use-cases. Property is optional.

Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>

Author: Codrin Ciubotariu

Documentation/devicetree/bindings/sound/microchip,pdmc.yaml

@@ -64,6 +64,15 @@ properties:
     maxItems: 4
     uniqueItems: true
 
+  sound-name-prefix:
+    pattern: "^PDMC[0-9]$"
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      used as prefix for sink/source names of the component. Must be a
+      unique string among multiple instances of the same component.
+      The name can be "PDMC0" or "PDMC1" ... "PDMCx", where x depends
+      on the maximum available instances on a Microchip SoC.
+
 required:
   - compatible
   - reg