Wifi: Do not ignore wifi interface down event

WLAN host driver shall issues interface down event during sub
system restart(SSR). Wifi framework requires this event for SoftAp
restart, hence do not ignore this event in TetherState controller.

Change-Id: I4342c383a9e82047aa926de061aa31521787d4e3
CRs-Fixed: 1071155
1 file changed