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panfrost: fix a GPU/CPU synchronization problem

Eric Smith requested to merge ericsmith/mesa:ericsmith/panfrost-gpu-sync into main 
panfrost: fix a GPU/CPU synchronization problem

Remove a premature optimization. When PIPE_MAP_DISCARD_WHOLE_RESOURCE
is set we were setting create_new_bo, and then if that was set we skipped
a set of tests which if passed would cause a panfrost_flush_writer.

In fact we need that flush in some cases (e.g. when any batch is
reading the resource). Moreover, we should sometimes copy the resource
(set the copy_resource flag) and that again was being skipped if
create_new_bo was initially true due to PIPE_MAP_DISCARD_WHOLE_RESOURCE
being set.

Cc: mesa-stable
Signed-off-by: Eric R. Smith <eric.smith@collabora.com>
Acked-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Edited by Eric Smith

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