New helper functions for registering lazy HALs

Added:
 * defaultLazyPassthroughServiceImplementation
 * registerLazyPassthroughServiceImplementation

Test: Register HAL using defaultLazyPassthroughServiceImplementation and
      check that it exits when it is not in use
Change-Id: I77b9f885f800c2838fad8003efc394bd1e1706da
1 file changed