Bluetooth: controller: Prevent multiple ticker_stop in cis_disabled_cb
Bluetooth: controller: Prevent multiple ticker_stop in cis_disabled_cb

When calling ull_conn_iso_cis_stop with no pending LLL events,
cis_disabled_cb may be called recursively if more than one CIS is
associated with a disconnecting ACL connection.

To prevent ticker_stop being called more than once, it shall be
registered at entry of cis_disabled_cb whether this is the last CIS.
Only then shall ticker_stop be called.

Signed-off-by: Morten Priess <eeac701aa7fa64292a00ac226283761853032460@oticon.com>

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