Add missing include to PSA test driver

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/tests/src/drivers/test_driver_aead.c b/tests/src/drivers/test_driver_aead.c
index 5928e0e..ac116ff 100644
--- a/tests/src/drivers/test_driver_aead.c
+++ b/tests/src/drivers/test_driver_aead.c
@@ -25,6 +25,7 @@
 
 #if defined(MBEDTLS_PSA_CRYPTO_DRIVERS) && defined(PSA_CRYPTO_DRIVER_TEST)
 #include "psa_crypto_aead.h"
+#include "psa_crypto_core.h"
 
 #include "test/drivers/aead.h"