Use the paging queue for buffer functions to avoid contention
with the other queues.
Reviewed-by: NJunwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Tested-by: NChen Gong <Curry.Gong@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>