mpc512x: Add esd gmbh mecp5123 board support

MECP5123 is a MPC5121E based module by esd gmbh.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Reinhard Arlt <reinhard.arlt@esd-electronics.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index bba6ce9..1f6008f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -28,6 +28,7 @@
 Reinhard Arlt <reinhard.arlt@esd-electronics.com>
 
 	cpci5200	MPC5200
+	mecp5123	MPC5121
 	mecp5200	MPC5200
 	pf5200		MPC5200