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
diff --git a/tools/buildbot-setup-device.sh b/tools/buildbot-setup-device.sh
index 3178209..54c928a 100755
--- a/tools/buildbot-setup-device.sh
+++ b/tools/buildbot-setup-device.sh
@@ -173,9 +173,4 @@
 
   # Create /linkerconfig directory in chroot.
   adb shell mkdir -p "$ART_TEST_CHROOT/linkerconfig"
-  # Ensure the linker uses a generated linker configuration (we generate this
-  # linker configuration file on device in `tools/buildbot-sync.sh`, as
-  # `/system/bin/linkerconfig` requires some files to be present in
-  # `/system/etc`).
-  adb shell setprop sys.linker.use_generated_config true
 fi