mac80211: Update to version 5.9.12-1

The removed patches were applied upstream.

Remove the 300-mac80211-optimize-skb-resizing.patch.
This patch was not applied upstream, but it conflicts with upstream
changes and needs bigger changes. It was applied with Felix to remove
this patch for now. It should be reworked and then send upstream later.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>