Set default values for common bdroid_buildcfg.h configurations

Because Bluetooth is a Mainline Module, the bdroid_buildcfg.h values
will no longer work to configure a device. Long term, we will have to
replace many of these configurations with sysprops, but for now we can
migrate common configurations to reasonable defaults that should work
for all devices.

Tag: #refactor
Bug: 217451700
Test: atest BluetoothInstrumentationTests
Change-Id: I3c7aed1bdb45db728d319f7d757400e44d232283