msm: camera: runtime reset sof frame id only for RDI

One RDI interface only have one AXI stream.
Therefore, when getting AXI start, we can reset the frame id.

However, one pix interface may have multiple stream,
we should not reset the pix frame id during runtime.

Change-Id: Iee95173ef85afb9f2da74ebe5363d0a13ded1df5
Signed-off-by: Peter Liu <pingchie@codeaurora.org>