wifi: rtw89: ser: reset total_sta_assoc and tdls_peer when L2

The total_sta_assoc and the tdls_peer are used for statistics accodring
to stations' information. L2 (Level 2) SER (system error recovery) will
call ieee80211_restart_hw() which re-invokes sta_state ops. And then,
the total_sta_assoc and tdls_peer will be re-increased. In case wrong
statistics results, we reset them in SER L2 handling.

Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230516082441.11154-2-pkshih@realtek.com