wifi: cfg80211: add link_station_info structure to support MLO statistics

wifi: cfg80211: add link_station_info structure to support MLO statistics

Current implementation of NL80211_GET_STATION does not work for
multi-link operation(MLO) since in case of MLO only deflink (or one
of the links) is considered and not all links.

Therefore to support for MLO, add link_station_info structure
to account link level statistics for station.

Additionally, add valid_links in station_info structure to indicate
bitmap of valid links for MLO. This will be helpful to check the link
related statistics during MLO.

Signed-off-by: Sarika Sharma <quic_sarishar@quicinc.com>
Link: https://patch.msgid.link/20250528054420.3050133-3-quic_sarishar@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>