msm: camera: reqmgr: Stop slot reset on buf done

This change is to stop slot reset on link in case of buf done.
If slot is required for applying either next or previous request
on sync link, then stop the slot reset for the link.

Change-Id: I296e450de94e273d17b1a9bb0879d879a63414f4
Signed-off-by: Ayush Kumar <ayushkr@codeaurora.org>