msm: camera: icp: Avoid merging the input fences

ICP driver merges all the input buffer fences in the context
of packet submission. But the context utility layer expects
individual fences to be signaled from the sync driver.
Hence remove the logic to merge the input fences.

Change-Id: I3e4bb183342e69dc826f9f937b79b6ae0c097e54
Signed-off-by: Lakshmi Narayana Kalavala <lkalaval@codeaurora.org>