crypto: engine - Create internal/engine.h

Create crypto/internal/engine.h to house details that should not
be used by drivers.  It is empty for the time being.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/crypto_engine.c

@@ -9,8 +9,8 @@
 
 #include <crypto/aead.h>
 #include <crypto/akcipher.h>
-#include <crypto/engine.h>
 #include <crypto/hash.h>
+#include <crypto/internal/engine.h>
 #include <crypto/kpp.h>
 #include <crypto/skcipher.h>
 #include <linux/err.h>

include/crypto/internal/engine.h

+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Crypto engine API
+ *
+ * Copyright (c) 2016 Baolin Wang <baolin.wang@linaro.org>
+ * Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au>
+ */
+#ifndef _CRYPTO_INTERNAL_ENGINE_H
+#define _CRYPTO_INTERNAL_ENGINE_H
+
+#include <crypto/engine.h>
+
+#endif