message: use "debug" namespace for system properties
  "filament.perfcounters" is renamed to "debug.filament.perfcounters",
  because otherwise it can't be set by users on recent Android
  versions.
diff: @@ -66,7 +66,7 @@ CommandStream::CommandStream(Driver& driver, CircularBuffer& buffer) noexcept
  {
  #ifdef ANDROID
  char property[PROP_VALUE_MAX];
  - __system_property_get("filament.perfcounters", property);
  + __system_property_get("debug.filament.perfcounters", property);
  mUsePerformanceCounter = bool(atoi(property));
  #endif
  }
  