hwc: gpu_tonemapper: Create Secure EGL Context

- HWC tonemapper passes secure flag to GPU tonemapper to create object
  with secure EGL context.
- Tonemapper object gets created with secure EGL context for the tone
  mapping of secure HDR layer.

CRs-Fixed: 2048764
Change-Id: I7129505283527dbab17f1e9731d8f141b48bb310
9 files changed