Make health storage HAL lazy

Make health storage HAL run only when needed.

Bug: 115675262
Test: Flash crosshatch, ensure android.hardware.health.storage@1.0-service
      is not running. Enable debug logging in vold. Run 'adb shell sm
      idle-maint run' and check logs to ensure vold runs "Start Dev GC
      on HAL"
Change-Id: I4bd48b5bb1b3ae7e1f4ccaff2042f1331e4cd76d