Revert "Disabling FGS start from System Alert Window"

Revert submission 25506346-296558535

Reason for revert: Potential culprit for b/327528820- verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Reverted changes: /q/submissionid:25506346-296558535

Change-Id: I7f400d2f5ae77281614f49b760301b5b396e4475