test-configs: Enable rseq kselftest on Tritium

The rseq tests are supported on arm64 and we have a reasonable amount of
capacity on the Tritium boards in my lab.

Signed-off-by: Mark Brown <[email protected]>

Author: broonie

config/core/test-configs.yaml

@@ -3081,6 +3081,7 @@ test_configs:
       - kselftest-membarrier
       - kselftest-mincore
       - kselftest-openat2
+      - kselftest-rseq
       - kselftest-seccomp
       - kselftest-timers
       - ltp-crypto