ipc4: header: Add support for generic bytes control

Add definition for generic bytes control and extend the
sof_ipc4_control_msg_payload struct to be able to handle bytes data as
well.

In other terms, the generic bytes control can be handled in similar way as
the ENUM or SWITCH generic control.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

Author: ujfalusi

src/include/ipc4/header.h

@@ -173,8 +173,9 @@ struct ipc4_message_reply {
 	} extension;
 } __attribute((packed, aligned(4)));
 
-#define SOF_IPC4_SWITCH_CONTROL_PARAM_ID 200
-#define SOF_IPC4_ENUM_CONTROL_PARAM_ID  201
+#define SOF_IPC4_SWITCH_CONTROL_PARAM_ID	200
+#define SOF_IPC4_ENUM_CONTROL_PARAM_ID		201
+#define SOF_IPC4_BYTES_CONTROL_PARAM_ID		202
 #define SOF_IPC4_NOTIFY_MODULE_EVENTID_ALSA_MAGIC_VAL ((uint32_t)(0xA15A << 16))
 
 /**
@@ -190,15 +191,19 @@ struct sof_ipc4_ctrl_value_chan {
 /**
  * struct sof_ipc4_control_msg_payload - IPC payload for kcontrol parameters
  * @id: unique id of the control
- * @num_elems: Number of elememnts in the chanv array
+ * @num_elems: Number of elements in the chanv array or number of bytes in data
  * @reserved: reserved for future use, must be set to 0
  * @chanv: channel ID and value array
+ * @data: binary payload
  */
 struct sof_ipc4_control_msg_payload {
 	uint16_t id;
 	uint16_t num_elems;
 	uint32_t reserved[4];
-	struct sof_ipc4_ctrl_value_chan chanv[];
+	union {
+		struct sof_ipc4_ctrl_value_chan chanv[0];
+		uint8_t data[0];
+	};
 } __attribute((packed, aligned(4)));
 
 /**