dm: Stop the dm_request calls in idle

Even if there are no pending peek work, dm layer trying to schedule
the work with 10ms time delay. This patch fixes the issue by putting
back the table entry.

Change-Id: I0e5df117fae74ae37a621862f254220706f0d840
Signed-off-by: AnilKumar Chimata <anilc@codeaurora.org>