ACL: Fix on_connection_packet_type_changed

This could happen before Connection Complete event is received from
controller.

We never did anything about it in legacy stack.
(HCI_CONN_PKT_TYPE_CHANGE_EVT is unused)

Bug: 174450658
Test: cert/run
Tag: #stability
Change-Id: Ia33dfb358988ebbd45abd66b9115e8529cf27d43