Remove unused BT_STACK_TEST_MODULE_ID

Test: compilation
Change-Id: I0aa9edd7e7d15df53bdd729cd4d0f0e424b13eab
diff --git a/include/hardware/bluetooth.h b/include/hardware/bluetooth.h
index 9fd91cb..f57872d 100644
--- a/include/hardware/bluetooth.h
+++ b/include/hardware/bluetooth.h
@@ -34,7 +34,6 @@
 
 #define BT_HARDWARE_MODULE_ID "bluetooth"
 #define BT_STACK_MODULE_ID "bluetooth"
-#define BT_STACK_TEST_MODULE_ID "bluetooth_test"
 
 
 /** Bluetooth profile interface IDs */