imx6: update 3.14 ventana dts with upstream fixes

imx6: update 3.14 ventana dts with upstream fixes

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 and
   not baseboard specific.
 - removed obsolete crts
 - fix include typo: The imx6q-gw51xx needs to include imx6qdl-gw51xx.dtsi
 - fix gw52xx clock for sgtl5000 ananlog audio codec
 - fix LVDS mapping for Ventana GW52xx/GW53xx/GW54xx
 - add LVDS backlight for Ventana
 - update model descriptions for all processor variants

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40988 3c298f89-4303-0410-b956-a3cf2f4a3e73