staging: rtl8723bs: remove unused BT structures

remove static BT debugging structures no longer in use.

Signed-off-by: Bryan Brattlof <hello@bryanbrattlof.com>
Link: https://lore.kernel.org/r/20210804144812.715695-1-hello@bryanbrattlof.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>