pc: Inline pc_init_pci_1_3() into pc_init_pci_1_2()

Just to make the commit after next easier to review.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-id: 1365780303-26398-2-git-send-email-armbru@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>