Merge branch 'selftests-drv-net-iou-zcrx-improve-stability-and-make-the-large-chunk...

Jakub Kicinski says:

====================
selftests: drv-net: iou-zcrx: improve stability and make the large chunk test work

The iou-zcrx test hasn't been passing in NIPA, I assumed it's because
we're missing iouring changes, but it's still failing after the merge
window. Turns out there was a bug in the implementation which was fixed
separately via the iouring tree. With that out of the way the tests
are passing but flaky. Patch 1 deals with the flakiness.

While looking at this I also noticed that the large chunk test isn't
running at all. So fix and enable it (patches 2 and 3).
====================

Link: https://patch.msgid.link/20260227171305.2848240-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>