Clear connection update pending flag when disconnected

For the hearing aid profile and when we get disconnection
while there is a pending connection update, then clear the flag so that
the next connection update can proceed.

Bug: 116317072
Bug: 116044083
Bug: 112050972
Test: Manual test to check for regressions
Change-Id: I54635a680cf276cf6c9f94520943c3efa97e77ec
Merged-In: Ib7d281fa6e50e0ee7cf75b552d829e2e8d4134ba