I'm not aware of any devices that support 48 kHz output in duplex
configuration, so disable that for now.
Doing this properly requires catching errors when on transport Acquire,
and switching to another configuration if the error was due to bad
configuration.
Due to how BAP specification works, it's not necessarily possible to
know whether a configuration was really accepted at earlier stage, and
anyway there's no proper error -> reconfiguration handling currently on
BlueZ side either.
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