imx6: update 3.10 ventana dts

update the Ventana DTS files with upstream fixes:
 - The 'model' property in the imx-audio-sgtl5000 binding specifies the
   user-visible name of the audio device. This should be something common an
   not baseboard specific.
 - update model descriptions for all processor variants

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
SVN-Revision: 40987