MX53: Add support to ESG ima3 board

The ESG ima3-mx53 board is based on the Freescale
i.MX53 SOC. It boots from NOR (128 MB) and
supports Ethernet (FEC), SATA.

Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/boards.cfg b/boards.cfg
index 4d839d2..0dee43f 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -192,6 +192,7 @@
 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
 mx53smd                      arm         armv7       mx53smd             freescale      mx5		mx53smd:IMX_CONFIG=board/freescale/mx53smd/imximage.cfg
+ima3-mx53                    arm         armv7       ima3-mx53           esg            mx5		ima3-mx53:IMX_CONFIG=board/esg/ima3-mx53/imximage.cfg
 vision2                      arm         armv7       vision2             ttcontrol      mx5		vision2:IMX_CONFIG=board/ttcontrol/vision2/imximage_hynix.cfg
 mx6qarm2                     arm         armv7       mx6qarm2            freescale      mx6		mx6qarm2:IMX_CONFIG=board/freescale/mx6qarm2/imximage.cfg
 mx6qsabrelite                arm         armv7       mx6qsabrelite       freescale      mx6		mx6qsabrelite:IMX_CONFIG=board/freescale/mx6qsabrelite/imximage.cfg