sdk: LineageHardwareService: Add fallback to HWC2

* We can't talk to DisplayTransformManager in C++, so
  we must have a fallback in the SDK itself for HWC2
* While we're at it, fix the size of the int array created
  in getDisplayColorCalibration() to be 5 rather than 6

Change-Id: Ic524f7d60ae1585efed3fba676cf3301dcaecd7f