msm: camera: isp: Fix frame drop pattern

In few scenarios, the request frame may get
delayed and current and request frame id may
become same. While user space is informed to
delay a frame in such scenarios, the pattern
shouldn't get reset.

Change-Id: I63f1301fbbe7cba024a686cbd783af25232f1293
Signed-off-by: Meera Gande <mgande@codeaurora.org>