adb_py: Build python3 module

Commit 1b06c6e40d90 ("Python 3 compatibility.") addressed python3
compatilbity issues for adb python package. Enable it in build.

Test: python3 test.py
Change-Id: Ie00e86f473a79f215b8e053a6ed8be5a2184e0a4
1 file changed