Ethernut 5 board support

Add support for the Ethernut 5 open hardware design, based
on Atmel's AT91SAM9XE512 SoC.

V4
 - Fix several coding style issues.
 - Move machine type to config file.
 - Remove use of CONFIG_ATMEL_LEGACY.

Signed-off-by: Tim Schendekehl <tim.schendekehl@egnite.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index 3a6d29c..4aa54d7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -142,6 +142,10 @@
 
 	rsk7264		SH7264
 
+egnite GmbH <info@egnite.de>
+
+	ethernut5	ARM926EJS (AT91SAM9XE SoC)
+
 Dirk Eibach <eibach@gdsys.de>
 
 	devconcenter	PPC460EX