PCI: Release IVRS table in AMD ACS quirk

The acpi_get_table() should be coupled with acpi_put_table() if the mapped
table is not used at runtime to release the table mapping.

In pci_quirk_amd_sb_acs(), IVRS table is just used for checking AMD IOMMU
is supported, not used at runtime, so put the table after using it.

Fixes: 15b100df

 ("PCI: Claim ACS support for AMD southbridge devices")
Link: https://lore.kernel.org/r/1595411068-15440-1-git-send-email-guohanjun@huawei.com
Signed-off-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>