pan/bi: Add nosched debug option

Forces a trivial schedule to replicate the old behaviour (for debugging
or benchmarking). Actually the new scheduler is still used, just highly
constrained; the net result should still do what's expected.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <!8354>
42 jobs for !8354 with scheduler in 10 minutes and 1 second (queued for 3 seconds)
merge request