MX51: Support for TTECH vision2 board

The patch adds support for TTECH vision2 board.
The board has 512MB RAM, SDHC slot and 4MB SPI
device from StMicron.

Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index 2cf29dd..b348559e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -547,6 +547,7 @@
 	polaris		xscale
 	trizepsiv	xscale
 	mx51evk		i.MX51
+ 	vision2		i.MX51
 
 Dirk Behme <dirk.behme@gmail.com>