Update makefiles for new build methods

Move prebuilt files to recovery/root so they are automatically copied by
recovery_root_private (no need for PRODUCT_COPY_FILES or prebuilt
modules).

Add chargeled under TARGET_RECOVERY_DEVICE_MODULES so that it becomes a
dependency of recovery.

Change-Id: I6f6022c6027f22f74dd0810f7701281e69a4b129