tests: fix guards in test suites to allow testing with PSASIM

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/src/psa_exercise_key.c b/tests/src/psa_exercise_key.c
index 937bd45..b223276 100644
--- a/tests/src/psa_exercise_key.c
+++ b/tests/src/psa_exercise_key.c
@@ -11,7 +11,7 @@
 #include <test/macros.h>
 #include <test/psa_exercise_key.h>
 
-#if defined(MBEDTLS_PSA_CRYPTO_C)
+#if defined(MBEDTLS_PSA_CRYPTO_CLIENT)
 
 #include <mbedtls/asn1.h>
 #include <psa/crypto.h>
@@ -1332,4 +1332,4 @@
 }
 #endif /* MBEDTLS_PK_C */
 
-#endif /* MBEDTLS_PSA_CRYPTO_C */
+#endif /* MBEDTLS_PSA_CRYPTO_CLIENT */