leaudio: Fix adding back to stream reconnected device

State machine incorrectly created CIS twice which lead btm_iso_impl.h to
assert that:
Abort message: '[FATAL:btm_iso_impl.h(226)] Assert failed: !(cis->state_flags & (kStateFlagIsConnected | kStateFlagIsConnecting)). Already connected or connecting

Bug: 227560629
Bug: 150670922
Test: atest --host bluetooth_le_audio_test bluetooth_le_audio_client_test
Sponsor: @jpawlowski
Change-Id: If2495df8a81076a5c61179e133219a5940dd6c6f