ASoC: dt-bindings: Add compatible string fsl,imx-audio-tlv320

Add compatible string fsl,imx-audio-tlv320 to fix below CHECK_DTBS warning:
  arch/arm/boot/dts/nxp/imx/imx6dl-gw5903.dtb: /sound: failed to match any schema with compatible: ['fsl,imx-audio-tlv320']

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20251010160321.2130093-1-Frank.Li@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: nxpfrankli

Documentation/devicetree/bindings/sound/fsl-asoc-card.yaml

@@ -79,6 +79,7 @@ properties:
               - fsl,imx-audio-nau8822
               - fsl,imx-audio-sgtl5000
               - fsl,imx-audio-si476x
+              - fsl,imx-audio-tlv320
               - fsl,imx-audio-tlv320aic31xx
               - fsl,imx-audio-tlv320aic32x4
               - fsl,imx-audio-wm8524