bluetooth: remove unused BDROID_BUILDCFG header

* Doesn't do anything if BOARD_HAVE_BLUETOOTH_BCM is not set.
* Bluetooth device name is parsed from 'ro.product.model' if no default
  is provided using 'bluetooth.device.default_name' property.

bluetooth/bdroid_buildcfg.h

@@ -1,12 +0,0 @@
-/*
- * Copyright (C) 2021-2022 KonstaKANG
- *
- * SPDX-License-Identifier: Apache-2.0
- */
-
-#ifndef _BDROID_BUILDCFG_H
-#define _BDROID_BUILDCFG_H
-
-#define BTM_DEF_LOCAL_NAME "Raspberry Pi 4"
-
-#endif