iris: wait for imported fences to be available in iris_fence_await

This ensures shared fence is available before we submit (and fail)
a batch with it, this fixes following issue on iris driver:
https://gitlab.freedesktop.org/mesa/mesa/-/issues/12650

Cc: mesa-stable
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33662>
1 file changed