[starnix] Disable flaky test: SyslogTest.ProcKmsgPoll

Change-Id: I835249e88fdeacfdd65bf319bf37ef4ef1d7a535
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1056274
Fuchsia-Auto-Submit: Benjamin Lerman <qsr@google.com>
Reviewed-by: Kevin Lindkvist <lindkvist@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>

Author: qsr

src/starnix/tests/syscalls/cpp/expectations/syscalls_cpp_test.json5

@@ -19,6 +19,10 @@
 
                 // TODO(): Make these tests reliably pass in Starnix then re-enable.
                 "FcntlLockTest.*",
+
+                // TODO(https://fxbug.dev/342416456): Rework the test to take
+                // into account logs from the system.
+                "SyslogTest.ProcKmsgPoll",
             ],
         },
         {