x86, calgary: Make Calgary IOMMU use IOMMU_INIT_* macros.

We utilize the IOMMU_INIT macros to create this dependency:

     [pci_xen_swiotlb_detect]
         |
     [pci_swiotlb_detect_override]
         |
     [pci_swiotlb_detect_4gb]
         |
      [detect_calgary]

Meaning that 'detect_calgary' is going to be called after
'pci_swiotlb_detect'.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
LKML-Reference: <1282845485-8991-8-git-send-email-konrad.wilk@oracle.com>
CC: Muli Ben-Yehuda <muli@il.ibm.com>
CC: "Jon D. Mason" <jdmason@kudzu.us>
CC: "Darrick J. Wong" <djwong@us.ibm.com>
CC: Fujita Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>