dim: remove af and anf aliases

We don't generally apply patches to the drm-intel-fixes or
drm-intel-next-fixes trees, we cherry-pick instead, so the aliases are
unnecessary.

And, of course, anyone really needing them can add them as personal
aliases in their dimrc.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>