ASoC: imx-pcm-rpmsg: Fix warning of incorrect type in assignment

The format in rpmsg is defained as unsigned char, there is warning
when convert snd_pcm_format_t to it.

sound/soc/fsl/imx-pcm-rpmsg.c:164:43: sparse: warning: incorrect type in assignment (different base types)
sound/soc/fsl/imx-pcm-rpmsg.c:164:43: sparse:    expected unsigned char format
sound/soc/fsl/imx-pcm-rpmsg.c:164:43: sparse:    got restricted snd_pcm_format_t [usertype]
sound/soc/fsl/imx-pcm-rpmsg.c:167:43: sparse: warning: incorrect type in assignment (different base types)
sound/soc/fsl/imx-pcm-rpmsg.c:167:43: sparse:    expected unsigned char format
sound/soc/fsl/imx-pcm-rpmsg.c:167:43: sparse:    got restricted snd_pcm_format_t [usertype]

Refine the unused RPMSG_DSD_U16_LE and RPMSG_DSD_U32_LE for these
case to fix this sparse warning.

Fixes: 3c00eceb ("ASoC: imx-pcm-rpmsg: Add platform driver for audio base on rpmsg")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Link: https://lore.kernel.org/r/1620268240-1005-1-git-send-email-shengjiu.wang@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/imx-pcm-rpmsg.c

@@ -161,10 +161,10 @@ static int imx_rpmsg_pcm_hw_params(struct snd_soc_component *component,
 		msg->s_msg.param.format   = RPMSG_S24_LE;
 		break;
 	case SNDRV_PCM_FORMAT_DSD_U16_LE:
-		msg->s_msg.param.format   = SNDRV_PCM_FORMAT_DSD_U16_LE;
+		msg->s_msg.param.format   = RPMSG_DSD_U16_LE;
 		break;
 	case SNDRV_PCM_FORMAT_DSD_U32_LE:
-		msg->s_msg.param.format   = SNDRV_PCM_FORMAT_DSD_U32_LE;
+		msg->s_msg.param.format   = RPMSG_DSD_U32_LE;
 		break;
 	default:
 		msg->s_msg.param.format   = RPMSG_S32_LE;

sound/soc/fsl/imx-pcm-rpmsg.h

@@ -328,9 +328,9 @@
 #define	RPMSG_S16_LE		0x0
 #define	RPMSG_S24_LE		0x1
 #define	RPMSG_S32_LE		0x2
-#define	RPMSG_DSD_U16_LE	0x3
+#define	RPMSG_DSD_U16_LE	49  /* SNDRV_PCM_FORMAT_DSD_U16_LE */
 #define	RPMSG_DSD_U24_LE	0x4
-#define	RPMSG_DSD_U32_LE	0x5
+#define	RPMSG_DSD_U32_LE	50  /* SNDRV_PCM_FORMAT_DSD_U32_LE */
 
 #define	RPMSG_CH_LEFT		0x0
 #define	RPMSG_CH_RIGHT		0x1