Add minimal operation to new fake camera emulator.

- Rework to match latest camera 2 HAL.

- Somewhat realistic scene lighting simulation, for allowing a
  realistic range of exposure and gain values.

- Supports raw Bayer sensor data only, at 640x480

- Only one stream configurable

- No support for reprocessing, 3A, flash, YUV, JPEG, etc

Bug: 6243944
Change-Id: I14fbad58ffeff37162c56d9daff7e4f75ab879c3
10 files changed