net/sched: flower: Add lock protection when remove filter handle

[William Tu]

* intro
As IDR can't protect itself from the concurrent modification, place
idr_remove() under the protection of tp->lock.

* how to fix
need to backport the patch from Jianbo
"net/sched: flower: Add lock protection when remove filter handle"
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=1fde0ca3a0de7e9f917668941156959dd5e9108b

* reproduce and verification
It's hard to reproduce because it is a race condition we found in k8s+ovn deployment.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-bluefield/5.15.0-1039.41 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux-bluefield' to 'verification-done-jammy-linux-bluefield'. If the problem still exists, change the tag 'verification-needed-jammy-linux-bluefield' to 'verification-failed-jammy-linux-bluefield'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!