nvk: Rework nvk_queue_submit_simple()

nvk: Rework nvk_queue_submit_simple()

This is a few changes rolled into one:

 1. Add a sync flag to force a stall before returning
 2. Re-order dw and push_dw_count to put the count first
 3. Take an array of extra BOs instead of just one

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24326>