[][MAC80211][Hacking MT76 Makefile]

[Description]
Add hacking MT76 Makefile to support new chips (MT7986/Bersa)
The patch files is based on Openwrt trunk's mt76 package only

[Release-log]
N/A

Change-Id: I51e97660cf6a399f1e5ee7e168f6b8cb29d12236
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/5784804
18 files changed