arc: Use ChromeOS host's IP address for WiFi ADB

Wireless debugging in ARC shows guest IP address
which is not routable from the local network for
other devices.

This patch updates the shown IP address to host's
IP address. This allows clients to know the correct
IP address to connect to.

The IP address used is taken from wifi IP of the
host set in a property:
'vendor.arc.net.ipv4.host_wifi_address'.

ARC R patch: ag/12907009

Bug: 169703040
Bug: 315430652
Test: Manually tested for ARC on tm-arc.
Change-Id: Ib66e84872d9004fa3a946f1af9a774709d048f5a