drm/msm/sde: fix QSEED3 scaler configuration

Setup scaler configuration before rectangle setup
to read decimation configuration before sspp rectangle
configuration. The patch also removes invalid YUV layer
width trimming for QSEED3 scaler. The even width trimming
causes the unpack block hang due to invalid phase
step configuration.

Change-Id: I391d2091765363fd714c6c81e2978ecfb0925495
Signed-off-by: Dhaval Patel <pdhaval@codeaurora.org>