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: I23729e2d79dac70a96ddb025e9852f7ac1bc3d3b
Signed-off-by: Ayush Kumar <ayushkr@codeaurora.org>