wireless: T6709: fix missing wpa_supplicant configuration

Commit 0ee8d5e35 ("ethernet: T6709: move EAPoL support to common framework")
added support to also have EAPoL on other interface types then ethernet. This
introduced a regression where the wireless interface wpa_supplicant configuration
would get deleted.

(cherry picked from commit 58dfd957fd8ec24caeca73105f7823148ef8c8bf)