Add string for "Connected via Wi-Fi assistant".
Add string for "Connected via Wi-Fi assistant".

Bug: 18525241
Change-Id: I9900d9216ad1b2d5c4bee584b8f5185b4e552b7d

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base