sdm: drm: Add post-processing support in SDM

SDM added support for the DRM driver recently. This change
adds the similar support in the SDM to enable/disable
post-processing features via DRM driver for QDCM.

CRs-Fixed: 2007376
Change-Id: I39d8d2c76a28aac0675c559dceb6dcf74eb170fb
5 files changed