[][MAC80211][mt76][add 11be for mt7996e in mt76 Makefile]

[Description]
Add 11be support for mt7996e in the Makefile of mt76 package.

[Release-log]
N/A

Change-Id: I0aa08c9bacfea2700137f9f07cb219dbb44ec7a1
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6743949
1 file changed