libata: fix remaining ap->id

Merge order left libata-acpi and pata_scc with remainling usage of
ap->id.  Kill superflous id printing and substitute the remaining ones
with ap->print_id.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>