msm: camera: isp: Fix race condition b/w add and apply req

There is a chance that CRM shows request as ready while request is not
passed in isp pending list.

Change-Id: I0056b09b31d78629957ba196d148f1b308205753
Signed-off-by: Trishansh Bhardwaj <tbhardwa@codeaurora.org>