generic: drop extra-old-deprecated pending fix patch for sch codel

generic: drop extra-old-deprecated pending fix patch for sch codel

Remove patch 620-net_sched-codel-do-not-defer-queue-length-update from openwrt-23.05 as well.

Patch is actually an ancient patch that somehow manage to be ported for 7 solid years.

This comes from [1] where a fix patch was proposed. Nobody notice that the proposed patch was actually rejected upstream in favor of [2]. And the upstream fix patch is present in kernel from version 4.18.

This means that we were actually fixing for a non existant bug and maybe introducing regression down the line.

Drop the patch for good as we already have a fix for it in flace for a long time.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=109581
[2] torvalds/linux@35b42da

Automatic refresh:
target/linux/generic/hack-5.15/660-fq_codel_defaults.patch

Tested on ramips/mt7621

Signed-off-by: Antony Kolitsos <zeusomighty@hotmail.com>
Link: https://github.com/openwrt/openwrt/pull/18791
Signed-off-by: Robert Marko <robimarko@gmail.com>