gumstix-xfce-image: add package for imx6
gumstix-xfce-image: add package for imx6

i.MX6 needs vivante driver and libglx module for xorg on desktop image.

Signed-off-by: Jason Liu <76a57ac72627ac6bc35b47c28a9937340c51b1c2@gumstix.com>

gumstix/meta-gumstix-extras,gumstix/meta-gumstix-extras,gumstix/meta-gumstix-extras