On some drivers, setting the tx power on the interface is not enough.
Set it for the phy as well.
Fixes: 04fb05914ea7 ("wifi-scripts: add multi-radio config support")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit b795e5cbcffc54e858bc8d3bde0031a2ca32377e)