msm: camera: isp: Reset sof counter before enable the CSID path

This change will enable RDI path after flush operation in dual vfe
usecase. In flush operation, stop hw is triggered which disable CSID
path, to enable CSID path again after flush, sof counter need to
be reset.

Change-Id: If904f3745ca29ee3261f1d6ea4796edfefe93f35
Signed-off-by: Ayush Kumar <ayushkr@codeaurora.org>