yuga: make wifi.c not load a modules

Unset WIFI_*_MODULE_PATH to libhardware_legacy's wifi.c will not attempt
to manage modules.  Under the current setup with wcn36xx, this is not
appropriate and it makes the preconfigured wpa_supplicant services
non-functional.

Change-Id: Ice40903f5a83837034cee69de1fdad43ea1b9f85
yuga: setup wpa_supplicant.conf

Push the initial wpa_supplicant.conf conf during system load, usually
the libhardware_legacy code will do this during module loading, but
since this is now disabled, do this manually.

Change-Id: I649f2ad9e1ed98634555cfa32551a452d453dfda