[crypto] Upgrade AES and RSA code to upstream axTLS version 1.4.5

All axTLS files are now vanilla versions of the upstream axTLS files,
with one minor exception: the unused "ctx" parameter of
bi_int_divide() has been marked with "__unused" to avoid a compilation
error.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/crypto/axtls/config.h

@@ -0,0 +1,13 @@
+#ifndef AXTLS_CONFIG_H
+#define AXTLS_CONFIG_H
+
+/**
+ * @file config.h
+ *
+ * Trick the axtls code into building within our build environment.
+ */
+
+#define CONFIG_SSL_ENABLE_CLIENT 1
+#define CONFIG_BIGINT_CLASSICAL 1
+
+#endif