sdm: Add property to define max upscaling limit.

- Add property 'sdm.max_upscale' to define max upscaling
  by SDE. If upscaling requirement exceeds max_upscale value,
  use GPU for composition.

CRs-Fixed: 2020598
Change-Id: I5ab225c8f39acb4147933e33cf0420d4e8e626a7
2 files changed