iommu/amd: Fix sysfs leak in iommu init

iommu/amd: Fix sysfs leak in iommu init

During the iommu initialization, iommu_init_pci() adds sysfs nodes.
However, these nodes aren't remove in free_iommu_resources() subsequently.

Fixes: 39ab9555c241 ("iommu: Add sysfs bindings for struct iommu_device")
Signed-off-by: Kun(llfl) <llfl@linux.alibaba.com>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/c8e0d11c6ab1ee48299c288009cf9c5dae07b42d.1715215003.git.llfl@linux.alibaba.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>