Revert "Increase timeout for the 570-checker-osr test from 20s to 60s."

The timeout was an actual test failure, fixed by
    https://android-review.googlesource.com/217041

Bug: 28210356

This reverts commit d676227d.

Change-Id: If69e09f3650f87cd4e6e22bb28a7b807be3094e1