gpu-viv-bin-mx6q: Don't package X11 libraries in non-X11 builds

Running

  readelf --dynamic libGL.so | grep NEEDED

shows that the library has runtime dependencies on X11 libs and libglapi.so.
However, none of them are listed as build dependencies for non-X11 distros.

In this case, skip packaging libGL, so that it doesn't cause unexpected
dependency changes in buildhistory.

Signed-off-by: Jacob Kroon <jacob.kroon@mikrodidakt.se>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
image_types_fsl.bbclass: Mask out 'sdcard' image type

The 'sdcard' image type is handled outside the image generation
library and needs to be masked out of graph dependency.

Change-Id: I2438009e47cebb133e6916550c6e16db3aab9d8f
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>