ASoC: fsl_asrc_dma: fix duplicate debugfs directory error

This driver registers a component for asrc. This is also used together
with easrc, both attached using the device name as component name.
Eventually debugfs directories with identical name are created in
soc_init_component_debugfs(), leading to error message:
debugfs: '30c90000.easrc' already exists in 'tqm-tlv320aic32'
Fix this by adding the debugfs_prefix.

Signed-off-by: Alexander Stein <[e-mail]>
Reviewed-by: Fabio Estevam <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

sound/soc/fsl/fsl_asrc_dma.c

···
 	.pointer	= fsl_asrc_dma_pcm_pointer,
 	.pcm_construct	= fsl_asrc_dma_pcm_new,
 	.legacy_dai_naming = 1,
+#ifdef CONFIG_DEBUG_FS
+	.debugfs_prefix	= "asrc",
+#endif
 };
 EXPORT_SYMBOL_GPL(fsl_asrc_component);