MAINTAINERS: meson-drm: remove useless git repository

Meson DRM is switching to drm-misc, so remove the freedesktop drm/meson-drm
git repository from MAINTAINERS entry.
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1491292894-9190-1-git-send-email-narmstrong@baylibre.com

MAINTAINERS

@@ -4258,7 +4258,6 @@ W:	http://linux-meson.com/
 S:	Supported
 F:	drivers/gpu/drm/meson/
 F:	Documentation/devicetree/bindings/display/amlogic,meson-vpu.txt
-T:	git git://anongit.freedesktop.org/drm/drm-meson
 T:	git git://anongit.freedesktop.org/drm/drm-misc
 
 DRM DRIVERS FOR EXYNOS