packagegroup-fsl-gstreamer-full: Remove gst-plugins-gl to support SL.

i.MX6SL cannot use mesa for Graphics and it lacks 3D support,
so skip it for now

Signed-off-by: Neena Busireddy <neena.busireddy@freescale.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>