iommu/amd: Update alloc_irq_table and alloc_irq_index

Pass amd_iommu structure as one of the parameter to these functions
as its needed to retrieve variable tables inside these functions.

Co-developed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20220706113825.25582-20-vasant.hegde@amd.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>