powerpc: xes: Add maintainer

Add Peter Tyser as the maintainer of Extreme Engineering Solutions products.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/xes/xpedite517x/MAINTAINERS b/board/xes/xpedite517x/MAINTAINERS
index 035cb14..26e0acc 100644
--- a/board/xes/xpedite517x/MAINTAINERS
+++ b/board/xes/xpedite517x/MAINTAINERS
@@ -1,5 +1,5 @@
 XPEDITE517X BOARD
-#M:	-
+M:	Peter Tyser <ptyser@xes-inc.com>
 S:	Maintained
 F:	board/xes/xpedite517x/
 F:	include/configs/xpedite517x.h