arm: Remove ethernut5 board

As per the maintainers at egnite GmbH, they are no longer interested in
supporting this board. Go and remove the platform here. Furthermore,
this is the only AT91SAM9XE platform in-tree so remove supporting code
for that as well.

Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-at91/include/mach/hardware.h b/arch/arm/mach-at91/include/mach/hardware.h
index 0a16c8f..988ef49 100644
--- a/arch/arm/mach-at91/include/mach/hardware.h
+++ b/arch/arm/mach-at91/include/mach/hardware.h
@@ -9,8 +9,7 @@
 
 #if defined(CONFIG_AT91RM9200)
 # include <asm/arch/at91rm9200.h>
-#elif defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9G20) || \
-	defined(CONFIG_AT91SAM9XE)
+#elif defined(CONFIG_AT91SAM9260) || defined(CONFIG_AT91SAM9G20)
 # include <asm/arch/at91sam9260.h>
 #elif defined(CONFIG_AT91SAM9261) || defined(CONFIG_AT91SAM9G10)
 # include <asm/arch/at91sam9261.h>