ASoC: imx-rpmsg: Assign platform driver used by machine driver to link with

Each ASoC platform driver is named by rpmsg channel. ASoC machine
driver can parse "fsl,rpmsg-channel-name" property to figure out which
ASoC platform driver it should link with.
Signed-off-by: Chancel Liu <chancel.liu@nxp.com>
Acked-by: Shengjiu Wang <shengjiu.wang@gmail.com>
Link: https://lore.kernel.org/r/20220930064441.2548505-8-chancel.liu@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/imx-rpmsg.c

@@ -58,6 +58,7 @@ static int imx_rpmsg_probe(struct platform_device *pdev)
 	struct platform_device *rpmsg_pdev = to_platform_device(dev);
 	struct device_node *np = rpmsg_pdev->dev.of_node;
 	struct of_phandle_args args;
+	const char *platform_name;
 	struct imx_rpmsg *data;
 	int ret = 0;
 
@@ -109,7 +110,10 @@ static int imx_rpmsg_probe(struct platform_device *pdev)
 	}
 
 	data->dai.cpus->dai_name = dev_name(&rpmsg_pdev->dev);
-	data->dai.platforms->name = IMX_PCM_DRV_NAME;
+	if (!of_property_read_string(np, "fsl,rpmsg-channel-name", &platform_name))
+		data->dai.platforms->name = platform_name;
+	else
+		data->dai.platforms->name = "rpmsg-audio-channel";
 	data->dai.playback_only = true;
 	data->dai.capture_only = true;
 	data->card.num_links = 1;