Revert remaining half of "gallium/dri2: Pass the resource that corresponds to the...

Revert remaining half of "gallium/dri2: Pass the resource that corresponds to the plane"

As documented in 6ec7e0d40664 (gallium: document convention for get_handle
calls on multi-planar resources) it's the drivers responsibility to walk
the chain of resources for multi-planar resources. The get_handle interface
should always be called with the base resource by the frontend.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Simon Ser <contact@emersion.fr>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10212>