hostapd: Allow reuse of existing interface for AP MLD

hostapd: Allow reuse of existing interface for AP MLD

Commit 00c2c20d74ee ("hostapd: Maintain single wpa_driver_nl80211_data
(drv) object across interfaces") adds 2nd AP MLD interface as a new
interface. However, in cases where the interface is already created and
are supposed to be reused, due to the new interface request, addition of
a new AP MLD fails.

Leverage the reuse parameter and handle the additional error code during
interface add for such cases and update the interface mode to
NL80211_IFTYPE_AP.

Fixes: 00c2c20d74ee ("hostapd: Maintain single wpa_driver_nl80211_data (drv) object across interfaces")
Signed-off-by: Purushottam Kushwaha <quic_pkushwah@quicinc.com>
Signed-off-by: Chenming Huang <quic_chenhuan@quicinc.com>