Revert "Allow Shell to access MANAGE_GAME_ACTIVITY."

This reverts commit 9d9268e6.

Reason for revert: DroidMonitor: Potential culprit for Bug b/217792792 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Change-Id: I8f0f469a8fd83b8096e2d2c595a588a762443a88