Add initial pass on a multi-part test driver

Signed-off-by: Steven Cooreman <steven.cooreman@silabs.com>
diff --git a/tests/include/test/drivers/test_driver.h b/tests/include/test/drivers/test_driver.h
index 75135e0..7ee8e5e 100644
--- a/tests/include/test/drivers/test_driver.h
+++ b/tests/include/test/drivers/test_driver.h
@@ -24,5 +24,6 @@
 
 #include "test/drivers/signature.h"
 #include "test/drivers/keygen.h"
+#include "test/drivers/cipher.h"
 
 #endif /* PSA_CRYPTO_TEST_DRIVER_H */