[][MAC80211][build][Fix patch fail]

[Description]
Fix patch fail
Add symbolic link of mt76-vendor for unified sigma support.
Remove unnecessary compiler flag in MT76 makefile

[Release-log]
N/A

Change-Id: Ia4e297c0648a77c4e500d926fb617cba6a1a85fb
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6140808
diff --git a/autobuild_mac80211_release/package/kernel/mt76/patches/1114-mt76-airtime-fairness-feature-off-in-mac80211.patch b/autobuild_mac80211_release/package/kernel/mt76/patches/1114-mt76-airtime-fairness-feature-off-in-mac80211.patch
index cdf982e..391933b 100644
--- a/autobuild_mac80211_release/package/kernel/mt76/patches/1114-mt76-airtime-fairness-feature-off-in-mac80211.patch
+++ b/autobuild_mac80211_release/package/kernel/mt76/patches/1114-mt76-airtime-fairness-feature-off-in-mac80211.patch
@@ -1,14 +1,14 @@
-From 29464597b5c41cd45618b034c5e4338217fa93d4 Mon Sep 17 00:00:00 2001
+From 3cbacf679f9fba714955123374dd59fbe33d7a32 Mon Sep 17 00:00:00 2001
 From: Evelyn Tsai <evelyn.tsai@mediatek.com>
 Date: Fri, 6 May 2022 15:58:42 +0800
 Subject: [PATCH 1114/1115] mt76: airtime fairness feature off in mac80211
 
 ---
- drivers/net/wireless/mediatek/mt76/mac80211.c | 1 -
+ mac80211.c | 1 -
  1 file changed, 1 deletion(-)
 
 diff --git a/mac80211.c b/mac80211.c
-index dc3c63e9..5600a09a 100644
+index dc3c63e..5600a09 100644
 --- a/mac80211.c
 +++ b/mac80211.c
 @@ -427,7 +427,6 @@ mt76_phy_init(struct mt76_phy *phy, struct ieee80211_hw *hw)
@@ -20,5 +20,5 @@
  
  	wiphy->available_antennas_tx = phy->antenna_mask;
 -- 
-2.25.1
+2.18.0