Wifi: Fix 2 ip addresses issue

Invoking the function clearInterfaceAddresses to clear
the initial IP first when change the "IP Settings"
for the select AP.

Change-Id: I38f6614e66cc3cf8d84e03c19d2d4badb1b16108
CRs-Fixed: 683307
Merge "Wifi: Fix 2 ip addresses issue" into kitkat3