sdm: Fix hwc2 compilation

- Remove marking hdr flags in hwc2 as HDR features
  needs having tonemapper included, until that don't
  tag any layers are HDR
- Include hwc socket handler in HWCSession

Change-Id: Ia560e9e21ef8e73ba81844bed7dde849381bdf61
Crs-fixed: 1110393
2 files changed