module_adapter: add mixer component for initialization

Add mixer component in module_adapter initialization function
otherwise, for IPC3, we get the following error:
"module_adapter_init_data() unsupported comp type 6".

Fixes: 0f4a246 ("module_adapter: fix switch case for spec parsing")

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>

src/audio/module_adapter/module_adapter_ipc3.c

@@ -75,6 +75,7 @@ int module_adapter_init_data(struct comp_dev *dev,
 	case SOF_COMP_SELECTOR:
 	case SOF_COMP_DEMUX:
 	case SOF_COMP_MUX:
+	case SOF_COMP_MIXER:
 	case SOF_COMP_DCBLOCK:
 	case SOF_COMP_SMART_AMP:
 	case SOF_COMP_MODULE_ADAPTER: