cts: add testAospFileContexts to known failures

Bug: 63115400
Test: None
Change-Id: I3b8e89ba7a57d6aae7afbb9ebc3bd8ada3c2588f
(cherry picked from commit e41a885a9f6639a87639b987b9d88602785a097d)
diff --git a/tools/cts-tradefed/res/config/cts-known-failures.xml b/tools/cts-tradefed/res/config/cts-known-failures.xml
index 02da822..2774890 100644
--- a/tools/cts-tradefed/res/config/cts-known-failures.xml
+++ b/tools/cts-tradefed/res/config/cts-known-failures.xml
@@ -165,6 +165,9 @@
     <!-- b/31803630 -->
     <option name="compatibility:exclude-filter" value="CtsSecurityTestCases android.security.cts.ListeningPortsTest" />
 
+    <!-- b/63115400 -->
+    <option name="compatibility:exclude-filter" value="CtsSecurityTestCases android.security.cts.SELinuxHostTest#testAospFileContexts" />
+
     <!-- b/36686383 -->
     <option name="compatibility:exclude-filter" value="CtsIncidentHostTestCases com.android.server.cts.ErrorsTest#testANR" />