staging: wfx: drop struct wfx_queue_stats

There is no reason to keep the intermediate struct wfx_queue_stats.
Relocate its members to struct wfx_dev.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200401110405.80282-25-Jerome.Pouiller@silabs.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>