Added submodule contents into tree

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

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+/* ecp_alt.h with dummy types for MBEDTLS_ECP_ALT */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#ifndef ECP_ALT_H
+#define ECP_ALT_H
+
+typedef struct mbedtls_ecp_group {
+    const mbedtls_ecp_group_id id;
+    const mbedtls_mpi P;
+    const mbedtls_mpi A;
+    const mbedtls_mpi B;
+    const mbedtls_ecp_point G;
+    const mbedtls_mpi N;
+    const size_t pbits;
+    const size_t nbits;
+}
+mbedtls_ecp_group;
+
+#endif /* ecp_alt.h */