Bluetooth: Add Bluetooth HCI core specific debug support

Configuration option BLUETOOTH_DEBUG_HCI_CORE enables debug support
for Bluetooth HCI core. This allows us to fine tune debug output.

Change-Id: Ibc9a90192b8f3318f9683cef4781d0c3d6ae9f7b
Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>

make/target/kconfig/modules/bluetooth.kconf

@@ -59,6 +59,15 @@ config	BLUETOOTH_DEBUG_UART
 	  This option enables debug support for Bluetooth UART
 	  driver
 
+config	BLUETOOTH_DEBUG_HCI_CORE
+	bool
+	prompt "Bluetooth HCI core debug"
+	depends on BLUETOOTH_DEBUG
+	default n
+	help
+	  This option enables debug support for Bluetooth HCI
+	  core
+
 config	BLUETOOTH_UART
 	bool
 	prompt "Bluetooth UART driver"

net/bluetooth/hci_core.c

@@ -42,6 +42,11 @@
 #include "hci_core.h"
 #include "conn.h"
 
+#if !defined(CONFIG_BLUETOOTH_DEBUG_HCI_CORE)
+#undef BT_DBG
+#define BT_DBG(fmt, ...)
+#endif
+
 /* How many buffers to use for incoming ACL data */
 #define ACL_IN_MAX	7
 #define ACL_OUT_MAX	7