Switch SERCOM7 (Debug UART) to sync mode + add STDIO

this will allow us to do printf()

Change-Id: Ibf4ba961d4bbf8d787558f38f3d557422587aad3
diff --git a/sysmoOCTSIM/config/stdio_redirect_config.h b/sysmoOCTSIM/config/stdio_redirect_config.h
new file mode 100644
index 0000000..3515c0c
--- /dev/null
+++ b/sysmoOCTSIM/config/stdio_redirect_config.h
@@ -0,0 +1,9 @@
+/* Auto-generated config file stdio_redirect_config.h */
+#ifndef STDIO_REDIRECT_CONFIG_H
+#define STDIO_REDIRECT_CONFIG_H
+
+// <<< Use Configuration Wizard in Context Menu >>>
+
+// <<< end of configuration section >>>
+
+#endif // STDIO_REDIRECT_CONFIG_H