drm/msm/sde: reject large downscale during inline rotation

Reject any vertical downscale greater than or equal to 1.1x
in the planes whenever inline rotation for video mode is
enabled. This matches a hardware requirement to allow the
rotator hardware to finish before the fixed rotate start
time.

Change-Id: I0f42d6f1df243a643b3ca5ca31fcc4d005033309
Signed-off-by: Clarence Ip <cip@codeaurora.org>