FP3: Remove unused bdroid_buildcfg.h

Since Android 13 moved Bluetooth to module, this file is unused.

* BTM_DEF_LOCAL_NAME: is now bluetooth.device.default_name property
* MAX_ACL_CONNECTIONS: new default MAX_BD_CONNECTIONS & MAX_L2CAP_LINKS
  match
* MAX_L2CAP_CHANNELS: is now 64 instead of 16
* BLE_VND_INCLUDED: new default matches
* BT_CLEAN_TURN_ON_DISABLED: unused in Android 11
* AVDT_NUM_SEPS: new default matches

Issue: FP3-A13#50
Change-Id: I63ae56dc8d568cc18341adf6b2928368d4bb488e
(cherry picked from commit 1546bc12069552c96851b3c4fe8f714ba3bf3ff0)