Remove unused dut_mode from bluetooth interface

...pp/jni/com_android_bluetooth_btservice_AdapterService.cpp

system/bta/dm/bta_dm_api.cc

system/bta/include/bta_api.h

system/btif/include/btif_api.h

system/btif/src/bluetooth.cc

system/btif/src/btif_core.cc

system/btif/test/btif_core_test.cc

system/btif/test/btif_hh_test.cc

system/gd/rust/topshim/src/btif.rs

system/include/hardware/bluetooth.h

system/main/shim/btm_api.h

system/service/hal/bluetooth_interface.cc

system/service/hal/fake_bluetooth_interface.cc

system/stack/btm/btm_devctl.cc

system/stack/hcic/hcicmds.cc

system/stack/include/btm_api.h

system/stack/include/hcimsgs.h

system/test/headless/headless.cc

system/test/mock/mock_bta_dm_api.cc

system/test/mock/mock_bta_dm_api.h