ipacm: put rndis under wifi using SW-path

When device in WIFI backhaul, make usb-tethering
not ipa-offload because of the wifi-stats issue
and wlan-team will only support WDI enable when
WIFI + SoftAP enable at the same time

Change-Id: I6b4ce88ec16fa49d5c0ba269b30cae6845af6ae1