wifi: mac80211: remove DISALLOW_PUNCTURING_5GHZ code

Since iwlwifi was the only driver using this and no
longer does, we can remove all this code.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250609213231.4dff5fb8890f.Ie531f912b252a0042c18c0734db50c3afe1adfb5@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>