Support for the MX31ADS evaluation board from Freescale

This patch adds support for the MX31ADS evaluation board from Freescale,
initialization code is copied from RedBoot sources, also provided by Freescale.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
diff --git a/Makefile b/Makefile
index 9fa8b63..f160d25 100644
--- a/Makefile
+++ b/Makefile
@@ -2604,6 +2604,9 @@
 imx31_phycore_config	: unconfig
 	@$(MKCONFIG) $(@:_config=) arm arm1136 imx31_phycore NULL mx31
 
+mx31ads_config		: unconfig
+	@$(MKCONFIG) $(@:_config=) arm arm1136 mx31ads NULL mx31
+
 #========================================================================
 # i386
 #========================================================================