wifi: cfg80211: add support for NAN data interface

wifi: cfg80211: add support for NAN data interface

This new interface type represents a NAN data interface (NDI).
It is used for data communication with NAN peers.

Note that the existing NL80211_IFTYPE_NAN interface, which is the NAN
Management Interface (NMI), is used for management communication.

An NDI interface is started when a new NAN data path is about to
be established, and is stopped after the NAN data path is terminated.

- An NDI interface can only be started if the NMI is running, and NAN is
  started.
- Before the NMI is stopped, the NDI interfaces will be stopped.

Add the new interface type, handle add/remove operations for it,
and makes sure of the conditions above.

Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20260219114327.0d681335c2e2.I92973483e927820ae2297853c141842fdb262747@changeid
Link: https://patch.msgid.link/20260318123926.206536-4-miriam.rachel.korenblit@intel.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>