ASoC: SOF: move definition of snd_sof_ipc to header file

Move definition of struct snd_sof_ipc to the header file so it can be
shared with new IPC versions.

Signed-off-by: Rander Wang <rander.wang@intel.com>

sound/soc/sof/ipc.c

@@ -25,18 +25,6 @@ static void ipc_stream_message(struct snd_sof_dev *sdev, u32 msg_cmd);
  * IPC message Tx/Rx message handling.
  */
 
-/* SOF generic IPC data */
-struct snd_sof_ipc {
-	struct snd_sof_dev *sdev;
-
-	/* protects messages and the disable flag */
-	struct mutex tx_mutex;
-	/* disables further sending of ipc's */
-	bool disable_ipc_tx;
-
-	struct snd_sof_ipc_msg msg;
-};
-
 struct sof_ipc_ctrl_data_params {
 	size_t msg_bytes;
 	size_t hdr_bytes;

sound/soc/sof/sof-priv.h

@@ -375,6 +375,18 @@ struct snd_sof_ipc_msg {
 	bool ipc_complete;
 };
 
+/* SOF generic IPC data */
+struct snd_sof_ipc {
+	struct snd_sof_dev *sdev;
+
+	/* protects messages and the disable flag */
+	struct mutex tx_mutex;
+	/* disables further sending of ipc's */
+	bool disable_ipc_tx;
+
+	struct snd_sof_ipc_msg msg;
+};
+
 enum snd_sof_fw_state {
 	SOF_FW_BOOT_NOT_STARTED = 0,
 	SOF_FW_BOOT_PREPARE,