MX53: support for freescale MX53LOCO board

This patch add initial support for freescale MX53LOCO board.
Network(FEC),SD/MMC,UART have been supported by this patch

Signed-off-by: Jason Liu <jason.hui@linaro.org>
diff --git a/boards.cfg b/boards.cfg
index 9f2b118..3fd2870 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -129,6 +129,7 @@
 efikamx                      arm         armv7       efikamx             -              mx5
 mx51evk                      arm         armv7       mx51evk             freescale      mx5		mx51evk:IMX_CONFIG=board/freescale/mx51evk/imximage.cfg
 mx53evk                      arm         armv7       mx53evk             freescale      mx5		mx53evk:IMX_CONFIG=board/freescale/mx53evk/imximage.cfg
+mx53loco                     arm         armv7       mx53loco            freescale      mx5		mx53loco:IMX_CONFIG=board/freescale/mx53loco/imximage.cfg
 vision2                      arm         armv7       vision2             ttcontrol      mx5
 cm_t35                       arm         armv7       cm_t35              -              omap3
 omap3_overo                  arm         armv7       overo               -              omap3