These two methods only have one implementation, and the spec they're
implementing means any other implementation is unlikely, verging on
impossible.

So replace them with simple functions.
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
Reviewed-by: NLaurent Vivier <lvivier@redhat.com>
Tested-by: NDaniel Barboza <danielhb@linux.vnet.ibm.com>