wifi: cfg80211: fix sband iftype data lookup for AP_VLAN

AP_VLAN interfaces are virtual, so doesn't really exist as a type for
capabilities. When passed in as a type, AP is the one that's really intended.

Fixes: c4cbaf79

 ("cfg80211: Add support for HE")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Link: https://lore.kernel.org/r/20230622165919.46841-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>