Fixes for STM32 TrustZone benchmark #47

Job	Run time
test_external_libs (External wolfTPM, config/examples/sim-tpm.config, true)	24s
test_external_libs (External wolfSSL, config/examples/sim.config)	18s
test_external_libs (Unit tests, true)	1m 44s
test_external_libs (external wolfHSM, config/examples/sim-wolfHSM-client.config)	28s
	2m 54s

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