MAINTAINERS: fix location of some display DT bindings

MAINTAINERS: fix location of some display DT bindings

Those files got a manufacturer's name prepended and were moved around.
Adjust their references accordingly.

Also, due those movements, Documentation/devicetree/bindings/video
doesn't exist anymore.

Cc: David Airlie <[email protected]>
Cc: David Lechner <[email protected]>
Cc: Peter Senna Tschudin <[email protected]>
Cc: Martin Donnelly <[email protected]>
Cc: Martyn Welch <[email protected]>
Cc: Stefan Agner <[email protected]>
Cc: Alison Wang <[email protected]>
Cc: Eric Anholt <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Acked-by: Jonathan Corbet <[email protected]>