SW: Use xserver-xorg-video-all + xserver-xorg-input-all in GRML_FULL, GRML_MEDIUM...

Instead of specifying all the extra xserver-xorg-* packages
let's just use the -all packages. If we notice any problems
with specific packages out of them (e.g. for disk space reasons)
we might consider falling back to explicitely specifying the
package names again, but for now let's give that approach a shot.

Thanks: Tong Sun <suntong@cpan.org>
Signed-off-by: Michael Prokop <mika@grml.org>