wifi: cfg80211: Drop entries with invalid BSSIDs in RNR

Ignore AP information for entries that include an invalid
BSSID in the TBTT information field, e.g., all zeros BSSIDs.

Fixes: c8cb5b85 ("nl80211/cfg80211: support 6 GHz scanning")
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230424103224.5e65d04d1448.Ic10c8577ae4a85272c407106c9d0a2ecb5372743@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>