add ASTRO MCF5373L board

This patch adds support for ASTRO board(s) based on MCF5373L.

Signed-off-by: Wolfgang Wegner <w.wegner@astro-kom.de>
diff --git a/Makefile b/Makefile
index 398e94d..e004303 100644
--- a/Makefile
+++ b/Makefile
@@ -1976,6 +1976,10 @@
 ## Coldfire
 #########################################################################
 
+astro_mcf5373l_config \
+astro_mcf5373l_RAM_config :	unconfig
+	@$(MKCONFIG) -t $(@:_config=) astro_mcf5373l m68k mcf532x mcf5373l astro
+
 M5208EVBE_config :		unconfig
 	@$(MKCONFIG) $(@:_config=) m68k mcf52x2 m5208evbe freescale