Revert "SW: provide xserver-xorg-video-intel on GRML_FULL"

This reverts commit 487e689322d6ec9c4336f0b337fd5ed54267358e.

Quoting from the package description:

| The use of this driver is discouraged if your hw is new enough (ca.
| 2007 and newer). You can try uninstalling this driver and let the
| server use it's builtin modesetting driver instead.

Thanks: Axel Beckert for the hint