pan/bi: Iterate from zero when setting RA interference

It is now valid for a node to have an index of zero.

Fixes: 39aa8c4a ("pan/bi: Switch to new IR")
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <!8358>
42 jobs for !8358 with cl-bi in 10 minutes and 25 seconds (queued for 5 seconds)
merge request