validate() converts the country alias to country_code and deletes country
before setup_phy() runs, so the iw reg set branch tested a null
config.country and never ran, leaving wdev-only radios (adhoc/mesh/monitor)
on the world regdomain. Use config.country_code.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
56d466a75d