msm: vidc: Update capture port only for non-DS usecases after reconfig

Do not update height and width on capture port, if downscalar
is explicitly enabled from v4l2 client. Without this change,
when OPB-DPB were configured in split mode, driver would not
update the new frame dimensions on capture port.

Change-Id: Ic6668406ced61565ae3cc96c145acc81f9ecc3b1
Signed-off-by: Arun Menon <avmenon@codeaurora.org>