remove mistaken added declaration.

Author: zxystd

IntelBluetoothFirmware/BtIntel.h

@@ -144,8 +144,6 @@ class BtIntel : public OSObject {
     OSDeclareAbstractStructors(BtIntel)
 public:
 
-    USBDeviceController *extracted();
-    
     virtual bool initWithDevice(IOService *client, IOUSBHostDevice *dev);
 
     virtual void free() override;