nl80211: Register read_sta_data() handler for station only builds

This driver_op can now be used in station mode, too, to fetch
information about the connection with the AP, so allow this to be used
even if wpa_supplicant is built without AP mode support.

Change-Id: Ibef1d27ed0e2df312e715a88d500500c661860d1
Signed-hostap: Jouni Malinen <j@w1.fi>
4 files changed