change DEVICE_SERIAL logging to use 'localhost:'

The previous code output 'emulator-N', which no longer works. Now the
device shows up in adb as 'localhost:N+1'.

Bug: 195331922
Test: ran locally, verified that device shows up under expected serial
Change-Id: Ifae91fea9952a22c2607680f8989c8019fea0f96
1 file changed
tree: f22430bf4c10a7ff985d9142982088d98823c73e
  1. project/
  2. .clang-format
  3. LICENSE
  4. PREUPLOAD.cfg