Don't query AAAA in case DUT has only link local address.

Some Wifi APs may send empty RA which cause device has link-local IPv6
address with default route. In that case, DNS resolver will send AAAA
queries over IPv4, which is a waste of effort. This commit prevents the
DNS resolver from sending AAAA queries when the device's IPv6 address is
link-local. The mdns (aka .local) resolution is not limited to this.

Bug: 203748535
Bug: 238583316
Test: build and test
Change-Id: Id63b144a0fabc86caf529c83d4d0b21f9f1e4bf8