wifi: nl80211: don't allow DFS channels for NAN

wifi: nl80211: don't allow DFS channels for NAN

NAN cannot use DFS channels.
Mark DFS channels as unusable if the chandef is to be used for NAN.

Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20260108102921.c2a5a0a14b9f.Idca29fb8a235df980e63b733a298fd1f2bdf2f48@changeid
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20260219094725.3846371-3-miriam.rachel.korenblit@intel.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>