MAINTAINERS: make linux-aspeed list remarks consistent

Commit f15a3ea8 ("MAINTAINERS: Add ASPEED BMC GFX DRM driver entry")
does not mention that linux-aspeed@lists.ozlabs.org is moderated for
non-subscribers, but the other three entries for
linux-aspeed@lists.ozlabs.org do.

By 'majority vote' among entries, let us assume it was just missed here and
adjust it to be consistent with others.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200912183334.22683-1-lukas.bulwahn@gmail.com

MAINTAINERS

@@ -5411,7 +5411,7 @@ F:	drivers/gpu/drm/panel/panel-arm-versatile.c
 
 DRM DRIVER FOR ASPEED BMC GFX
 M:	Joel Stanley <joel@jms.id.au>
-L:	linux-aspeed@lists.ozlabs.org
+L:	linux-aspeed@lists.ozlabs.org (moderated for non-subscribers)
 S:	Supported
 T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	Documentation/devicetree/bindings/gpu/aspeed-gfx.txt