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