msm: mdss: remove YUV upscale limitation

Parameters check for YUV upscaling when doing chroma upsampling is not
required, hardware is able to support up to 40x up scaling for chroma
components so this check is not needed.

Change-Id: I700282c4627df5a630def6072b8deba38bb58b41
Signed-off-by: Adrian Salido-Moreno <adrianm@codeaurora.org>