panfrost: Add the bifrost tiler internal state field

panfrost: Add the bifrost tiler internal state field

The internal state is updated every time a tiler job is executed, and
pandecode complains that unused bits are not zero-ed when that happens.
Define the internal state (not meant to be set by the driver) to remove
those spurious errors.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7206>