ART: Blacklist test 911 for target

As usual, black-list an agent test for the target.

Bug: 31684812
Test: m test-art-host-run-test-911-get-stack-trace
Change-Id: I477ede7eb9b0ce7e76e3705d911052b332087e35
diff --git a/test/Android.run-test.mk b/test/Android.run-test.mk
index fcb6f4d..cfb05f9 100644
--- a/test/Android.run-test.mk
+++ b/test/Android.run-test.mk
@@ -277,6 +277,7 @@
   908-gc-start-finish \
   909-attach-agent \
   910-methods \
+  911-get-stack-trace \
 
 ifneq (,$(filter target,$(TARGET_TYPES)))
   ART_TEST_KNOWN_BROKEN += $(call all-run-test-names,target,$(RUN_TYPES),$(PREBUILD_TYPES), \