wifi: cfg80211: handle IBSS in channel switch

Prior to commit 7b0a0e3c ("wifi: cfg80211: do some
rework towards MLO link APIs") the interface type didn't
really matter here, but now we need to handle all of the
possible cases. Add IBSS ("ADHOC") and handle it.

Fixes: 7b0a0e3c ("wifi: cfg80211: do some rework towards MLO link APIs")
Reported-by:  <syzbot+90d912872157e63589e4@syzkaller.appspotmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>