Revert "msm: camera: ife: Stop tasklet after deinit"

This reverts commit ff736fcb.
The above change was committed to prevent tasklet deinit before
ISRs have completed execution due to erratic delays in tasklet
scheduling on early builds which was not stable. As builds have
stabilized now, we need to revert to normal driver behavior for
stop sequence.

Change-Id: I57127d3fe6fbbd5579241c1cfc978362ba302aef
Signed-off-by: Venkat Chinta <vchinta@codeaurora.org>