Revert "wifi: rtl8xxxu: enable MFP support"

This reverts commit 77f5924f.

There is a more elegant solution to check for not decrypted frames,
which is to check the security flag in the RX descriptor.

Revert commit 77f5924f ("wifi: rtl8xxxu: enable MFP support") in
favor of this to be able to send it to stable.
Signed-off-by: Martin Kaistra <martin.kaistra@linutronix.de>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://msgid.link/20240418071813.1883174-2-martin.kaistra@linutronix.de

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c

@@ -6468,9 +6468,7 @@ int rtl8xxxu_parse_rxdesc16(struct rtl8xxxu_priv *priv, struct sk_buff *skb)
 			rx_status->mactime = rx_desc->tsfl;
 			rx_status->flag |= RX_FLAG_MACTIME_START;
 
-			if (!rx_desc->swdec &&
-			    !(_ieee80211_is_robust_mgmt_frame(hdr) &&
-			      ieee80211_has_protected(hdr->frame_control)))
+			if (!rx_desc->swdec)
 				rx_status->flag |= RX_FLAG_DECRYPTED;
 			if (rx_desc->crc32)
 				rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
@@ -6575,9 +6573,7 @@ int rtl8xxxu_parse_rxdesc24(struct rtl8xxxu_priv *priv, struct sk_buff *skb)
 			rx_status->mactime = rx_desc->tsfl;
 			rx_status->flag |= RX_FLAG_MACTIME_START;
 
-			if (!rx_desc->swdec &&
-			    !(_ieee80211_is_robust_mgmt_frame(hdr) &&
-			      ieee80211_has_protected(hdr->frame_control)))
+			if (!rx_desc->swdec)
 				rx_status->flag |= RX_FLAG_DECRYPTED;
 			if (rx_desc->crc32)
 				rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
@@ -7997,7 +7993,6 @@ static int rtl8xxxu_probe(struct usb_interface *interface,
 	ieee80211_hw_set(hw, HAS_RATE_CONTROL);
 	ieee80211_hw_set(hw, SUPPORT_FAST_XMIT);
 	ieee80211_hw_set(hw, AMPDU_AGGREGATION);
-	ieee80211_hw_set(hw, MFP_CAPABLE);
 
 	wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST);