Make power caches non-isolating

The following two caches are no longer uid-isolating:
 * is_power_save_mode
 * is_interactive

The cache constructors have been reflowed slightly to match the latest
non-deprecated apis.

Flag: EXEMPT bug-fix
Bug: 379098894
Test: presubmit
Change-Id: I9219e15a1e11cf1cfc3a74341661d54c92d1e6f7