Add ::1 to localhost in etc/hosts

::1 is IPv6 loopback address.

Bug: 256507503
Test: $ adb shell /data/dnschk localhost
      # localhost (via nethandle 0):
      127.0.0.1
      ::1
Change-Id: Ibcee52a14143856db50fca301c48ea9e2591914b
1 file changed