cfg80211: Update TSF and TSF BSSID for multi BSS

When a new BSS entry is created based on multi BSS IE, the
TSF and the TSF BSSID were not updated. Fix it.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20201129172929.8377d5063827.I6f2011b6017c2ad507c61a3f1ca03b7177a46e32@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>