This reverts commit 55752949.

Commit 55752949 ("iommu/vt-d: Avoid duplicated pci dma alias
consideration") aimed to address a NULL pointer deference issue
happened when a thunderbolt device driver returned unexpectedly.

Unfortunately, this change breaks a previous pci quirk added by
commit cc346a47 ("PCI: Add function 1 DMA alias quirk for
Marvell devices"), as the result, devices like Marvell 88SE9128
SATA controller doesn't work anymore.

We will continue to try to find the real culprit mentioned in
55752949, but for now we should revert it to fix current
breakage.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=204627
Cc: Stijn Tintel <stijn@linux-ipv6.be>
Cc: Petr Vandrovec <petr@vandrovec.name>
Reported-by: Stijn Tintel <stijn@linux-ipv6.be>
Reported-by: Petr Vandrovec <petr@vandrovec.name>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>