diag: Fix error response during SSR

This patch addresses the scheduling conflicts of
control channel removal work by listening
to peripheral events.

CRs-Fixed: 1081265
Change-Id: Ib9f2448e564c4800535bd80d13c9bda5cc283c3c
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>