[][MAC80211][hostapd][Fix setting the wrong seg0 index for 5G center 159 BW40]

[Description]
Fix setting the wrong seg0 index 5G center 159 BW40
due to the fact that 6G BW320 also has center channel 159
This patch will be upstreamed later

[Release-log]
N/A

Change-Id: I78508c8b7d7e07358e184253ad28f8ba68d52cc4
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7427607
1 file changed