[WRT3200ACM] Some IoT devices can't connect to WiFi APs provided by the router

mwlwifi is known to have interoperability issues with esp8266 since day 1, chances for this to get fixed are effectively zero - Marvell didn't care during their tenure, NXP's only action was EOL'ing the 802.11ac chipsets.

In this situation the third radio (sdio/ mwifiex) might actually be more cooperative, but this easily introduces regdom issues and this radio was more meant to be used on the 5 GHz (for passive continuous DFS scans, although Linksys never actually deployed this feature) and doesn't really come with proper antennas either.

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