ccimx6 was the only platform using wpa_supplicant instead of hostapd for
SoftAP configuration, requiring additional platform-specific logic.
Since SoftAP works correctly with hostapd, drop the wpa_supplicant path
and unify the AP implementation across platforms.
https://onedigi.atlassian.net/browse/DEL-9923
Signed-off-by: Francisco Gil <francisco.gilmartinez@digi.com>
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