drop 3 patches based on RC review feedback

drop 3 patches based on RC review feedback

Dropped patches:

- "sched_ext: Use HK_TYPE_DOMAIN_BOOT to detect isolcpus= domain isolation"
  Queues: 6.12, 6.18
  Reason: build break — HK_TYPE_DOMAIN_BOOT is introduced by upstream
  commit 4fca0e550d50 ("sched/isolation: Save boot defined domain flags")..
  Report: https://lore.kernel.org/stable/508bf3b7-56c7-4290-b663-7daf8ed4e80d@googlemail.com/

- "vsock/virtio: fix potential unbounded skb queue"
  Queues: 6.6, 6.12, 6.18, 7.0
  Reason: Michael S. Tsirkin (VIRTIO maintainer) raised that this fix trades
  the DoS for silently broken sockets; Stefano Garzarella has a v3/v4
  follow-up in flight upstream. Drop from stable and wait for the proper
  upstream resolution.
  Report: https://lore.kernel.org/stable/20260515113503-mutt-send-email-mst@kernel.org/

- "media: mali-c55: Fix wrong comment of ISP block types"
  Queues: 7.0
  Reason: comment-only fix.
  Report: https://lore.kernel.org/stable/agdO8lvv9vj9_1n8@zed/

Signed-off-by: Sasha Levin <sashal@kernel.org>