msm: camera: reqmgr: reset slots after deactivating session

After Deactivate request comes in link control we are deactivating
the link and resetting every slots in the in_q.

CRs-Fixed: 2685198
Change-Id: I3f152d6486ccfe81ec44ea27ed992aacf18342bc
Signed-off-by: Wyes Karny <wkarny@codeaurora.org>