Fix pairing multiple devices in a row

If we don't cleanup the control block, pairing can get "stuck" and
pairing next device would be impossible without restarting Bluetooth.

Without this patch, folowing scenario fails:
1. Pair Dual mode capable LE Audio earbuds (set CSIS devices)
2. Pair another dual mode capable LE Audio earbuds (set of CSIS devices)
3. Pair HID remote (FAILS)

Sometimes step 2 is not needed for step 3 to fail.

Test: see commit message
Bug: 248340112
Change-Id: Idef1fe5e6c50d42c1a65281e02cfcfd7db2cdad3