at91: add support for the PM9261 board of Ronetix GmbH

The PM9261 board is based on the AT91SAM9261-EK board.

Here is the page on Ronetix website:
http://www.ronetix.at/starter_kit_9261.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 9379c7e..b5b5484 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -209,6 +209,7 @@
 
 Ilko Iliev <iliev@ronetix.at>
 
+	PM9261		AT91SAM9261
 	PM9263		AT91SAM9263
 
 Gary Jennejohn <garyj@denx.de>