sepolicy: fix hostapd rules for FST

FST was broken by commit 3e2b4523
("sepolicy: Adding rule for cnd"). Object was changed from
wifi_vendor_wpa_socket to wpa_socket. However wifi_vendor_wpa_socket
provides access to /data/vendor/wifi/sockets where wpa_socket
provides access to /data/misc/wifi/sockets.

Change-Id: Ia70999c3aedc4e073bfcc2ac72bde83d5b521aa4