at91: Add esd gmbh MEESC board support

This patch adds support for esd gmbh MEESC board.
The MEESC is based on an Atmel AT91SAM9263 SoC.

Signed-off-by: Daniel Gorsulowski <Daniel.Gorsulowski@esd.eu>
diff --git a/Makefile b/Makefile
index 4c9884c..0ae1d36 100644
--- a/Makefile
+++ b/Makefile
@@ -2791,6 +2791,9 @@
 	fi;
 	@$(MKCONFIG) -a at91sam9rlek arm arm926ejs at91sam9rlek atmel at91
 
+meesc_config	:	unconfig
+	@$(MKCONFIG) $(@:_config=) arm arm926ejs meesc esd at91
+
 pm9261_config	:	unconfig
 	@$(MKCONFIG) $(@:_config=) arm arm926ejs pm9261 ronetix at91