wifi-scripts: fix setting tx power on some drivers

On some drivers, setting the tx power on the interface is not enough.
Set it for the phy as well.

Fixes: 04fb05914e ("wifi-scripts: add multi-radio config support")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit b795e5cbcf)

package/network/config/wifi-scripts/files/lib/netifd/wireless/mac80211.sh

@@ -1203,6 +1203,14 @@ drv_mac80211_setup() {
 	wdev_tool "$phy$phy_suffix" set_config "$(json_dump)" $active_ifnames
 	json_set_namespace "$prev"
 
+	[ -z "$phy_suffix" ] && {
+		if [ -n "$txpower" ]; then
+			iw phy "$phy" set txpower fixed "${txpower%%.*}00"
+		else
+			iw phy "$phy" set txpower auto
+		fi
+	}
+
 	for_each_interface "ap sta adhoc mesh monitor" mac80211_set_vif_txpower
 	wireless_set_up
 }