at91: add support for the PM9263 board of Ronetix GmbH

The PM9263 board is based on the AT91SAM9263-EK board.

Here is the page on Ronetix website:
http://www.ronetix.at/starter_kit_9263.html

Signed-off-by: Ilko Iliev <iliev@ronetix.at>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 03d59b9..6bb03b4 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -204,6 +204,10 @@
 	KUP4K		MPC855
 	KUP4X		MPC859
 
+Ilko Iliev <iliev@ronetix.at>
+
+	PM9263		AT91SAM9263
+
 Gary Jennejohn <garyj@denx.de>
 
 	quad100hd	PPC405EP