MAINTAINERS: Update drm/i915 git repo

Moved to a common location so that Jani also can push to it, to avoid
moving it every time I go on vacation. Please update autobuilders and
everything else pointing at the drm-intel.git repo, the old one won't
be updated any more.

Cc: Dave Airlie <airlied@gmail.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

MAINTAINERS

@@ -2832,7 +2832,7 @@ M:	Jani Nikula <jani.nikula@linux.intel.com>
 L:	intel-gfx@lists.freedesktop.org
 L:	dri-devel@lists.freedesktop.org
 Q:	http://patchwork.freedesktop.org/project/intel-gfx/
-T:	git git://people.freedesktop.org/~danvet/drm-intel
+T:	git git://anongit.freedesktop.org/drm-intel
 S:	Supported
 F:	drivers/gpu/drm/i915/
 F:	include/drm/i915*