display: Do not align down input rotator src height

Aligning down the input rotator source height value introduces
green line in the output of the rotator. Remove aligning down the
input rotator source height for YV12 format.
For 1/8th downscale use aligndown instead of alignup.

Change-Id: I9152ee873c5ee79877653c78f33eb0cf7e2f9871
CRs-Fixed: 453033
1 file changed