libhwc2.1: Refactor the destination transform in ExynosMPP

Since ExynosMPP now all relies on the source image to get the transform
info, it is unnecessary to have transform info on the destination image.

Bug: 176158392
Test: Play 1/8 and 16x scaling in landscape mode
Change-Id: I44333ffb28751aff0aa17332298e09f23c763eaa
5 files changed