wifi: rtw89: parse PHY status only when PPDU is to_self

Without this fix, some non-self packets are used to count CFO (center
frequency offset), and average CFO has unstable variation. Then, it causes
unexpected performance.
Signed-off-by: Eric Huang <echuang@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/20221005083212.45683-3-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/core.c

@@ -1255,6 +1255,9 @@ static int rtw89_core_rx_parse_phy_sts(struct rtw89_dev *rtwdev,
 	if (phy_ppdu->ie < RTW89_CCK_PKT)
 		return -EINVAL;
 
+	if (!phy_ppdu->to_self)
+		return 0;
+
 	pos = (u8 *)phy_ppdu->buf + PHY_STS_HDR_LEN;
 	end = (u8 *)phy_ppdu->buf + phy_ppdu->len;
 	while (pos < end) {