dim: Fix dim_branches

The amount of repos/branches is not restricted to the ones in drm-intel
and drm-misc anymore. Now there are topic branches on drm repo and also
the drm-xe repo. Use wildcard matches to list anything under drm-* repos
and any topic branch, even those on drm repo.

One main difference is that now `dim create-workdir all` will really
checkout all topic branches. Users may be advised to checkout only what
it's interesting for them.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>