leaudio: Fix late CIS disconnect scenario.

During stopping the stream, when remote device supports caching, and
when CIS got disconnected after ASE goes into Configured state, the
state machine will wait for CIS disconnection and notify upper layer
about state.

Before this patch, in such scenario, CONFIGURED_BY_USER state could be
used which is incorrect, as this state can be used only when CISes are
not yet created. That would lead to missing SuspendedForReconfiguration
call from the client.cc

Bug: 281954121
Test: atest BluetoothInstrumentationTests
Test: atest bluetooth_le_audio_test
Tag: #feature
Change-Id: If5be7ccdc6c13564865b87261f0e09640dc1221a