[][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/0005-mt76-mt7915-drop-undefined-action-frame.patch b/autobuild_mac80211_release/package/kernel/mt76/patches/0005-mt76-mt7915-drop-undefined-action-frame.patch
index e65db45..c6af0f3 100644
--- a/autobuild_mac80211_release/package/kernel/mt76/patches/0005-mt76-mt7915-drop-undefined-action-frame.patch
+++ b/autobuild_mac80211_release/package/kernel/mt76/patches/0005-mt76-mt7915-drop-undefined-action-frame.patch
@@ -1,14 +1,14 @@
-From 169c87faf30925e8bdd4a841143a7cd640d892ca Mon Sep 17 00:00:00 2001
+From d5aa55dd78e4b047bbf462a65ac47b30409ad8f0 Mon Sep 17 00:00:00 2001
 From: Peter Chiu <chui-hao.chiu@mediatek.com>
 Date: Thu, 14 Apr 2022 15:18:02 +0800
-Subject: [PATCH 05/11] mt76: mt7915: drop undefined action frame
+Subject: [PATCH 05/12] mt76: mt7915: drop undefined action frame
 
 ---
- drivers/net/wireless/mediatek/mt76/mt7915/mac.c | 6 ++++++
+ mt7915/mac.c | 6 ++++++
  1 file changed, 6 insertions(+)
 
 diff --git a/mt7915/mac.c b/mt7915/mac.c
-index 9092b40f..6a4da8e6 100644
+index 9092b40..6a4da8e 100644
 --- a/mt7915/mac.c
 +++ b/mt7915/mac.c
 @@ -683,6 +683,8 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr,
@@ -32,5 +32,5 @@
  	if (id < 0)
  		return id;
 -- 
-2.25.1
+2.18.0