set zero shutdown timeout for eng build

- still it will take time to kill services, < 3 secs in tested device.

bug: 36678028
Test: reboot

(cherry picked from commit 56425ed87e1ad7c63437d67c3b17ed7e2ba8d340)

Change-Id: I75b5843b08cdcdbf67c4fe500aa0dd7302dd44d7