Added submodule contents into tree

externals/mbedtls/tests/include/alt-dummy/aes_alt.h

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+/* aes_alt.h with dummy types for MBEDTLS_AES_ALT */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#ifndef AES_ALT_H
+#define AES_ALT_H
+
+typedef struct mbedtls_aes_context {
+    int dummy;
+}
+mbedtls_aes_context;
+
+#if defined(MBEDTLS_CIPHER_MODE_XTS)
+
+typedef struct mbedtls_aes_xts_context {
+    int dummy;
+} mbedtls_aes_xts_context;
+#endif
+
+
+#endif /* aes_alt.h */