panfrost: Avoid wait=true flushing all batches

What is intended is to flush the batches and wait on a particular BO at
a later time. Explicitly forcing a wait immediately is redundant.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5995>
2 files changed