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/Makefile b/Makefile
index 3c9d853..aa4646f 100644
--- a/Makefile
+++ b/Makefile
@@ -824,6 +824,9 @@
 aria_config:	unconfig
 	@$(MKCONFIG) -a aria ppc mpc512x aria davedenx
 
+mecp5123_config:	unconfig
+	@$(MKCONFIG) -a mecp5123 ppc mpc512x mecp5123 esd
+
 mpc5121ads_config \
 mpc5121ads_rev2_config	\
 	: unconfig