MAINTAINERS: enlist Greg formally for console stuff

I did a few greps for main console data structures, and there's a few
places outside of drivers/video/console:
- a braille driver
- a sisusbvga driver
- fbcon, but I think that's fine if we leave that officially under
  fbdev maintainership
- lots of stuff in drivers/tty/vt, which is already under Greg's
  maintainership.

So I think this match gives reasonably useful Cc: lists for the files
and places I've tested.

Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://lore.kernel.org/r/20200803141142.1606661-1-daniel.vetter@ffwll.ch


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>