Historically, OL peers were forcibly destroyed during pdev detach. This
logic was mistakenly removed as part of another change. This led to peer
leaks during Sub-System Restart (SSR). Restore the peer delete logic to
close peer leaks during SSR.
Change-Id: I72d980750a2f97e6717f720a63f4a651f7615aee
CRs-Fixed: 2167237