msm: camera: reqmgr: Fix frame skip condition

During transiting from non-sync mode to sync mode with
pending requests to be still serviced in non-sync mode
the frame skip condition needs to be reset.

Change-Id: I613ae5bb98e67a9f613e3ea02ce4a8c1a078814d
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>