Revert LOW_POWER ble scan interval to 512/5120ms.

Changing the LOW_POWER scan interval back to the settings from O
and earlier. An experiment is being run in parallel to determine
battery impact of various parameter configurations.

Bug: 62491228
Test: Manual. Just changing a parameter here.
Change-Id: I4cf3715868434e063f87bc5f3800a1ddeb7d4ce6