ASoC: dt-bindings: fsl,sai: Add i.MX94 support

Add compatible string "fsl,imx94-sai" for the i.MX94 chip, which is
backward compatible with i.MX95. Set it to fall back to "fsl,imx95-sai".

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20250306171013.243332-1-Frank.Li@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/fsl,sai.yaml

@@ -41,6 +41,10 @@ properties:
               - fsl,imx93-sai
               - fsl,imx95-sai
               - fsl,vf610-sai
+      - items:
+          - enum:
+              - fsl,imx94-sai
+          - const: fsl,imx95-sai
 
   reg:
     maxItems: 1