PCI: fix pci_resource_alignment prototype

This fixes the prototype for both pci_resource_alignment() and
pci_sriov_resource_alignment().

Patch started as debugging effort from Cam Macdonell.

Cc: Cam Macdonell <cam@cs.ualberta.ca>
Cc: Avi Kivity <avi@redhat.com>
[chrisw: add iov bits]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>