sdm: Add support for WCG/HDR handling using SSPP

- Handle HDR using SSPP when such capability is available.
- For HW with SSPP tonemapping, color mode has to be set only
  when blend space is BT2020 and at the end of prepare.

Change-Id: Ibe87c145addf01c6615bb7946a86ada8e6b9dddc
Crs-fixed: 2234972
6 files changed