Disable ART run-test `053-wait-some` on gcstress configurations.

Disable this test on gcstress configurations, as it is time-sensitive
and this mode is known to slow down the execution of programs in
general and break some of the test's assertions w.r.t. execution
times.

Bug: 175435088
Test: art/test/testrunner/testrunner.py -t 053-wait-some
Change-Id: I397d948394b0803d77277acb2a72514393ccc529
diff --git a/test/knownfailures.json b/test/knownfailures.json
index 0ceb15e..9564041 100644
--- a/test/knownfailures.json
+++ b/test/knownfailures.json
@@ -1376,9 +1376,9 @@
     },
     {
         "tests": ["053-wait-some"],
-        "variant": "interp-ac",
+        "variant": "gcstress | interp-ac",
         "bug": "b/175435088",
-        "description": ["Test is time-sensitive and fails on interpreter-access-checks",
-                        "configuration."]
+        "description": ["Test is time-sensitive and fails on gcstress and",
+                        "interpreter-access-checks configurations."]
     }
 ]