[][MAC80211][mt76][set the first antenna for mt7915 radar detect]

[Description]
Add a mcu command to set the first antennta for radar detect in MT7915.

[Release-log]
N/A

Change-Id: I05e02c17f025567197aff6d4f7cfff540b60e83c
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/6322066
1 file changed