MAINTAINERS: Move the drm-intel repo location to fd.o GitLab

MAINTAINERS: Move the drm-intel repo location to fd.o GitLab

The drm-intel repo is moving from the classic fd.o git host to GitLab.
Update its location with a URL matching other fd.o GitLab kernel trees.

Signed-off-by: Ryszard Knop <ryszard.knop@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Tvrtko Ursulin <tursulin@ursulin.net>
Acked-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240424114159.38719-1-ryszard.knop@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>