Bluetooth: Classic: SCO: Modify `bt_sco_chan::ops` with `const`

Use `const` to modify the field `ops` of the structure
`struct bt_sco_chan`.

Signed-off-by: Lyle Zhu <lyle.zhu@nxp.com>

subsys/bluetooth/host/classic/hfp_ag.c

@@ -1399,7 +1399,7 @@ static void hfp_ag_sco_disconnected(struct bt_sco_chan *chan, uint8_t reason)
 
 static struct bt_conn *bt_hfp_ag_create_sco(struct bt_hfp_ag *ag)
 {
-	static struct bt_sco_chan_ops ops = {
+	static const struct bt_sco_chan_ops ops = {
 		.connected = hfp_ag_sco_connected,
 		.disconnected = hfp_ag_sco_disconnected,
 	};
@@ -3958,7 +3958,7 @@ static int hfp_ag_accept(struct bt_conn *conn, struct bt_rfcomm_server *server,
 static int bt_hfp_ag_sco_accept(const struct bt_sco_accept_info *info,
 		struct bt_sco_chan **chan)
 {
-	static struct bt_sco_chan_ops ops = {
+	static const struct bt_sco_chan_ops ops = {
 		.connected = hfp_ag_sco_connected,
 		.disconnected = hfp_ag_sco_disconnected,
 	};

subsys/bluetooth/host/classic/hfp_hf.c

@@ -4161,7 +4161,7 @@ static void hfp_hf_sco_disconnected(struct bt_sco_chan *chan, uint8_t reason)
 static int bt_hfp_hf_sco_accept(const struct bt_sco_accept_info *info,
 		      struct bt_sco_chan **chan)
 {
-	static struct bt_sco_chan_ops ops = {
+	static const struct bt_sco_chan_ops ops = {
 		.connected = hfp_hf_sco_connected,
 		.disconnected = hfp_hf_sco_disconnected,
 	};

subsys/bluetooth/host/classic/sco_internal.h

@@ -48,11 +48,11 @@ struct bt_sco_chan_ops {
 };
 
 struct bt_sco_chan {
-	struct bt_conn *sco;
+	struct bt_conn               *sco;
 	/** Channel operations reference */
-	struct bt_sco_chan_ops		*ops;
+	const struct bt_sco_chan_ops *ops;
 
-	enum bt_sco_state		state;
+	enum bt_sco_state            state;
 };
 
 /** @brief Initiate an SCO connection to a remote device.