Revert "Move keyguard enabled to Component Override"

Revert "Remove device/google/atv/overlay"

Revert "Remove device/google/atv overlay from RRO exclusion"

Revert submission 1510032-atv-rro

Reason for revert: b/178396156
Reverted Changes:
If9a99f850:Move keyguard enabled to Component Override
I1b0056b50:Make device/google/atv compatible with RRO
If766a0152:Remove device/google/atv overlay from RRO exclusio...
I9df2747d9:Remove device/google/atv/overlay
If689c72c2:Move device/google/atv overlays into SystemUI

Change-Id: I05f42caf8614c2c19ba5a33ec965843cc37cde98