[Wi-Fi] Wrong MAC address shown in Settings.

The MAC addresses in "About phone" and "Saved networks" may be different
because of new Randomized MAC mechanism.

1.Add new UIs to guide users to saved network and use different titles to
show different conditions.
2.Remove MAC address and IP fields in WifiPreference by new design.

Bug: 133466540
Test: add test case to check if the title changed according to the
privacy level.

Change-Id: Idb5972dc2565f6fe58a83f6aa7124abbc035888f