When testing under Valgrind for constant flow, skip test suites that don't
have any constant-flow annotations, since the testing wouldn't do anything
more that testing with ordinary Valgrind (component_test_valgrind).
This is a significant time saving since testing with Valgrind is very slow.
In Mbed TLS 2.28, MBEDTLS_USE_PSA_CRYPTO does not affect constant-time
functions, so testing in the full configuration covers all we need.
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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