wifi: mac80211: read ethtool's sta_stats from sinfo

Driver may update sinfo directly through .sta_statistics, so this
patch makes sure that ethool gets the correct statistics.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Link: https://lore.kernel.org/r/f9edff14dd7f5205acf1c21bae8e9d8f9802dd88.1661466499.git.ryder.lee@mediatek.com


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