include: bluetooth: Deprecate bt_hci_bus enumeration

bt_hci_bus enumeration is not used anymore.
This commit deprecates it.

Signed-off-by: Ioannis Damigos <[email protected]>

Author: ydamigos

include/zephyr/drivers/bluetooth.h

@@ -66,7 +66,7 @@ enum {
 };
 
 /** Possible values for the 'bus' member of the bt_hci_driver struct */
-enum bt_hci_bus {
+enum __deprecated bt_hci_bus { /* Use macro BT_DT_HCI_BUS_GET() instead */
 	BT_HCI_BUS_VIRTUAL       = 0,
 	BT_HCI_BUS_USB           = 1,
 	BT_HCI_BUS_PCCARD        = 2,
@@ -94,7 +94,9 @@ enum bt_hci_bus {
 #define BT_DT_HCI_NAME_GET(node_id) DT_PROP_OR(node_id, bt_hci_name, "HCI")
 #define BT_DT_HCI_NAME_INST_GET(inst) BT_DT_HCI_NAME_GET(DT_DRV_INST(inst))
 
-#define BT_DT_HCI_BUS_GET(node_id) DT_ENUM_IDX_OR(node_id, bt_hci_bus, BT_HCI_BUS_VIRTUAL)
+/* Fallback default when there's no property, same as "virtual" */
+#define BT_PRIV_HCI_BUS_DEFAULT (0)
+#define BT_DT_HCI_BUS_GET(node_id) DT_ENUM_IDX_OR(node_id, bt_hci_bus, BT_PRIV_HCI_BUS_DEFAULT)
 
 #define BT_DT_HCI_BUS_INST_GET(inst) BT_DT_HCI_BUS_GET(DT_DRV_INST(inst))