linux-imx

drm/etnaviv: add devicetree bindings

Etnaviv follows the same priciple as imx-drm to have a virtual
master device node to bind all the individual GPU cores together
into one DRM device.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Rob Herring <robh@kernel.org>