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

this will allow us to do printf()

Change-Id: Ibf4ba961d4bbf8d787558f38f3d557422587aad3
diff --git a/sysmoOCTSIM/stdio_start.h b/sysmoOCTSIM/stdio_start.h
new file mode 100644
index 0000000..bee5325
--- /dev/null
+++ b/sysmoOCTSIM/stdio_start.h
@@ -0,0 +1,31 @@
+/*
+ * Code generated from Atmel Start.
+ *
+ * This file will be overwritten when reconfiguring your Atmel Start project.
+ * Please copy examples or other code you want to keep to a separate file or main.c
+ * to avoid loosing it when reconfiguring.
+ */
+#ifndef STDIO_MAIN_H
+#define STDIO_MAIN_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#include <stdio.h>
+
+#include <stdio.h>
+#include <stdio_io.h>
+
+void STDIO_REDIRECT_0_example(void);
+
+/**
+ * \brief Initialize STDIO Redirect
+ */
+void stdio_redirect_init(void);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* STDIO_MAIN_H */