Deprecate sys.linker.use_generated_config

This property is set from the script but there is no effective code to
use this property. Removing this property as it is no longer in use.

Bug: 149335054
Bug: 147737840
Test: m -j passed
Test: art/test/testrunner/testrunner.py --target --64
      --optimizing -t 525 passed
Change-Id: I2721bbd7794c7b7ff21bee21e64a1f91d18db57a
1 file changed