Bluetooth: Explicitly stop all timers before frees

As a preventative measure, timers on dynamic memory structures must be
not running, or stopped, prior to freeing. Since it is safe to delete
timers whether running or not, all timers are deleted.

CRs-fixed: 328673
Change-Id: I255d99cb2419fad07caf445920050cf2d05ffe4d
Signed-off-by: Brian Gix <bgix@codeaurora.org>