CHROMIUM: [media] rk3288-vpu: Fix hangout corruption

CHROMIUM: [media] rk3288-vpu: Fix hangout corruption

If segmentation_enable flag is zero, no matter what
segmentation_update_flag is, we cannot set it to HW.
Before this patch, incorrect segmentation_update_flag
might be set to HW which caused hangout corruption.

BUG=chrome-os-partner:35531
TEST=make a video chat by hangout with other device.

Signed-off-by: ZhiChao Yu <zhichao.yu@rock-chips.com>
Reviewed-on: https://chromium-review.googlesource.com/242732
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Tomasz Figa <tfiga@chromium.org>
Commit-Queue: Tomasz Figa <tfiga@chromium.org>

Change-Id: I86c00c27d3c97854db8c4164289fa434b29819ff
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Yakir Yang <ykk@rock-chips.com>