MAINTAINERS: Update gma500 git repo

The GMA500 driver has been handled through drm-misc for a while but the
git repo hasn't been updated. Make sure it points to the right place.
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230921110038.2613604-1-mripard@kernel.org

MAINTAINERS

@@ -6925,7 +6925,7 @@ DRM DRIVERS FOR GMA500 (Poulsbo, Moorestown and derivative chipsets)
 M:	Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
 L:	dri-devel@lists.freedesktop.org
 S:	Maintained
-T:	git git://github.com/patjak/drm-gma500
+T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	drivers/gpu/drm/gma500/
 
 DRM DRIVERS FOR HISILICON