mx6: Add initial support for the Hummingboard solo

SolidRun has designed the Hummingboard board based on mx6q/dl/solo.

Add the initial support for the mx6 solo variant.

More information about this hardware can be found at:
http://imx.solid-run.com/wiki/index.php?title=Carrier-One_Hardware

(Carrier-One was the previous name of Hummingboard).

Based on the work from Jon Nettleton <jon.nettleton@gmail.com>.

Signed-off-by: Jon Nettleton <jon.nettleton@gmail.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
diff --git a/boards.cfg b/boards.cfg
index 9949bb5..1ac9003 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -310,6 +310,7 @@
 Active  arm         armv7          mx6         freescale       mx6sabresd          mx6qsabresd                          mx6sabresd:IMX_CONFIG=board/freescale/imx/ddr/mx6q_4x_mt41j128.cfg,MX6Q                                                           Fabio Estevam <fabio.estevam@freescale.com>
 Active  arm         armv7          mx6         freescale       mx6slevk            mx6slevk                             mx6slevk:IMX_CONFIG=board/freescale/mx6slevk/imximage.cfg,MX6SL                                                                   Fabio Estevam <fabio.estevam@freescale.com>
 Active  arm         armv7          mx6         barco           titanium            titanium                             titanium:IMX_CONFIG=board/barco/titanium/imximage.cfg                                                                         Stefan Roese <sr@denx.de>
+Active  arm         armv7          mx6         solidrun        hummingboard        hummingboard_solo                           hummingboard:IMX_CONFIG=board/solidrun/hummingboard/solo.cfg,MX6S,DDR_MB=512        Jon Nettleton <jon.nettleton@gmail.com>
 Active  arm         armv7          omap3       -               overo               omap3_overo                          -                                                                                                                                 Steve Sakoman <sakoman@gmail.com>
 Active  arm         armv7          omap3       -               pandora             omap3_pandora                        -                                                                                                                                 Grazvydas Ignotas <notasas@gmail.com>
 Active  arm         armv7          omap3       8dtech          eco5pk              eco5pk                               -                                                                                                                                 Raphael Assenat <raph@8d.com>