media:platform:tegra Stop duplicate singleshot

media:platform:tegra Stop duplicate singleshot

Issue: When a capture session is complete an extra singleshot is
sometimes issued causing syncpt timeouts in subsequent sessions.

Fix: When a capture is complete do not issue a single shot if there
is already an active one.

Bug 200291915

Change-Id: I0616978b2144a0539980087fd356d8c30299bcd0
Signed-off-by: Ian Kaszubski <ikaszubski@nvidia.com>
Reviewed-on: http://git-master/r/1503374
GVS: Gerrit_Virtual_Submit
Reviewed-by: Jaspreet Kaur <jkaur@nvidia.com>
Reviewed-by: Bhanu Murthy V <bmurthyv@nvidia.com>
Reviewed-by: Jihoon Bang <jbang@nvidia.com>