[][MAC80211][mt76][remove mt7915 BW160 support]

[Description]
Remove BW160 capability in mt7915.

[Release-log]
N/A

Change-Id: Ib7fd9b175bbb85694a0958418645d183087489a1
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7536263
1 file changed