For speed >= 8 and color_sensitivity not set, skip the transform
skipping test in UV planes.
Add a new condition to check noise level to skip chroma check
for speed >= 8 if y_sad is high.

1~2% speedup on ARM for speed 8.

Borg tests show neutral results in both rtc and rtc_derf.

Change-Id: Idecd3ff6e28c97757a43bb6f3a7082c85f72109c