XPedite5200 board support

Initial support for Extreme Engineering Solutions XPedite5200 -
a MPC8548-based PMC single board computer.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

MAINTAINERS

diff --git a/MAINTAINERS b/MAINTAINERS
index be10eb4..60def0c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -413,6 +413,7 @@
 
 Peter Tyser <ptyser@xes-inc.com>
 
+	XPEDITE5200	MPC8548
 	XPEDITE5370	MPC8572
 
 David Updegraff <dave@cray.com>