Revert "Support FLAG_ACTIVITY_LAUNCH_ADJACENT for launch root with adjacent"

This reverts commit d8abe76ba18e9baf6dcef68a65a03b6651c7e5ef.

Reason for revert: Bug: 186614428

Change-Id: Id7d1f57a11f0698f9377b00008994f9a6c3038d3
(cherry picked from commit 48f90b317b9845ee241b0175cd73a7f55d5b1dd9)
11 files changed