dt-bindings: drm/bridge: ti-sn65dsi86: Fix the video-interfaces.yaml references

video-interface.txt does not exist anymore, as it has been converted
to video-interfaces.yaml.

Instead of referencing video-interfaces.yaml multiple times,
pass it as a $ref to the schema.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Link: https://lore.kernel.org/r/20230412175800.2537812-1-festevam@gmail.com


Signed-off-by: Rob Herring <robh@kernel.org>