mpc5200: Add a3m071 board support

This patch adds support for the a3m071 board based on the
MPC5200.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index c430574..428b006 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -388,6 +388,8 @@
 
 Stefan Roese <sr@denx.de>
 
+	a3m071		MPC5200
+
 	P3M7448		MPC7448
 
 	uc100		MPC857