Modify apex_available to Bluetooth apex

Bluetooth apex name has changed from com.android.btservices to
com.android.bt. We now need to update the reference in the code.

Updating apex_available in bp and other reference from within the code

Bug: 383863941
Flag: Exempt build infra
Test: m .
Change-Id: Ia7c5b5f71b306d8af4a9a9feb82f25590ef7d905
1 file changed