dt-bindings: gpu: Convert v3d to json-schema

This converts the v3d bindings to yaml format.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/1610564917-11559-1-git-send-email-stefan.wahren@i2se.com


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