Added submodule contents into tree

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

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+/* timing_alt.h with dummy types for MBEDTLS_TIMING_ALT */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#ifndef TIMING_ALT_H
+#define TIMING_ALT_H
+
+struct mbedtls_timing_hr_time {
+    int dummy;
+};
+
+typedef struct mbedtls_timing_delay_context {
+    int dummy;
+} mbedtls_timing_delay_context;
+
+
+#endif /* timing_alt.h */