Fix vrapi missing Oculus Go device type;
Fix vrapi missing Oculus Go device type;

- Backported the OCULUSGO device type enumerant.  Need to test to
  determine if the Oculus Go still reports this device type or if
  it just reports unknown.
- A more involved fix will be to use JNI to discover the build model
  from the Android settings.

bjornbytes/lovr,bjornbytes/lovr,bjornbytes/lovr,bjornbytes/lovr,bjornbytes/lovr