Move psa_crypto_slot_management.h out from psa_crypto_helpers.h

Signed-off-by: Przemyslaw Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/tests/src/psa_exercise_key.c b/tests/src/psa_exercise_key.c
index 923d2c1..29e673a 100644
--- a/tests/src/psa_exercise_key.c
+++ b/tests/src/psa_exercise_key.c
@@ -29,6 +29,7 @@
 #include <psa/crypto.h>
 
 #include <test/asn1_helpers.h>
+#include <psa_crypto_slot_management.h>
 #include <test/psa_crypto_helpers.h>
 
 #if defined(MBEDTLS_PSA_CRYPTO_SE_C)