Revert "Revert "Add setting for enabling CPU frequency scaling.""

This reverts commit 67503522.

Reason for revert: Added SElinux policy to allow the service to be started. Verified by local testing on the latest pi-wear-dev.

Bug: 74018496
Bug: 75974893
Change-Id: I9bd8939f6292be9c160e19ebdf934023792059ba