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: If20ef7671c06a1d3bde7adc5a05a6a489b2622e2
Signed-off-by: Om Parkash <oparkash@codeaurora.org>