[][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/1007-mt76-mt7915-add-support-for-runtime-set-in-band-disc.patch b/autobuild_mac80211_release/package/kernel/mt76/patches/1007-mt76-mt7915-add-support-for-runtime-set-in-band-disc.patch
index fb5e85b..6b9eb74 100644
--- a/autobuild_mac80211_release/package/kernel/mt76/patches/1007-mt76-mt7915-add-support-for-runtime-set-in-band-disc.patch
+++ b/autobuild_mac80211_release/package/kernel/mt76/patches/1007-mt76-mt7915-add-support-for-runtime-set-in-band-disc.patch
@@ -1,4 +1,4 @@
-From 7a1c00a4418ca3b5cf4e41aaeaca56b9f9b64b63 Mon Sep 17 00:00:00 2001
+From 274c1a2fe580cc2f1948b7f53df228eee8a20ba3 Mon Sep 17 00:00:00 2001
 From: MeiChia Chiu <meichia.chiu@mediatek.com>
 Date: Fri, 27 May 2022 15:51:48 +0800
 Subject: [PATCH 1007/1008] mt76: mt7915:add support for runtime set in-band
@@ -6,11 +6,11 @@
 
 Signed-off-by: MeiChia Chiu <MeiChia.Chiu@mediatek.com>
 ---
- drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 5 ++---
+ mt7915/mcu.c | 5 ++---
  1 file changed, 2 insertions(+), 3 deletions(-)
 
 diff --git a/mt7915/mcu.c b/mt7915/mcu.c
-index 34409759..a3ccc7a2 100644
+index 65d21ee..7f2161f 100644
 --- a/mt7915/mcu.c
 +++ b/mt7915/mcu.c
 @@ -2006,8 +2006,7 @@ mt7915_mcu_beacon_inband_discov(struct mt7915_dev *dev, struct ieee80211_vif *vi
@@ -33,5 +33,5 @@
  	buf = (u8 *)tlv + sizeof(*discov);
  
 -- 
-2.25.1
+2.18.0