drm/qxl: add spice-devel list to MAINTAINERS

So qxl kernel patches are sent to the spice-devel list for review.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20181121090129.23506-1-kraxel@redhat.com

MAINTAINERS

@@ -4735,6 +4735,7 @@ DRM DRIVER FOR QXL VIRTUAL GPU
 M:	Dave Airlie <airlied@redhat.com>
 M:	Gerd Hoffmann <kraxel@redhat.com>
 L:	virtualization@lists.linux-foundation.org
+L:	spice-devel@lists.freedesktop.org
 T:	git git://anongit.freedesktop.org/drm/drm-misc
 S:	Maintained
 F:	drivers/gpu/drm/qxl/