leaudio: Fix disconnection on timeout

With this patch, if LeAudio code decides to for ACL disconnection,
it will always notifies GATT about the disconnection.

Bug: 266789088
Test: manual
Tag: #feature
Change-Id: I3ebc9d117940f3badb3a022a1a239ad6ff489ff6
(cherry picked from commit 599a17dc)
Merged-In: I3ebc9d117940f3badb3a022a1a239ad6ff489ff6