Add support to test interrupt remapping support via VFIO ioctls

[dhsrivas]

Adds functionality to test interrupt remapping support for a PCI device using VFIO ioctls.

• Verifies if the PCI device supports "count" MSI-X interrupts.

• Binds the input PCI device to the vfio-pci driver.

• Attempts to allocate "count" number of IRQs with IOMMU Interrupt remapping enabled; the test fails if allocation is unsuccessful.

  This patch is depended on

  1. utils: Add PCI device, drivers, modules, dmesg related avocado utilities avocado-framework/avocado#6225
  2. utils/vfio: Add APIs for VFIO container and device management avocado-framework/avocado#6226

[dhsrivas]

Adding test run sample log

# avocado run io/iommu/interrupt.py -p pci_device="0000:71:00.0" -p count=512
JOB ID     : e64b86a7edf2a260ebc5ffea5cc362134709ed40
JOB LOG    : /root//results/job-2025-09-02T06.26-e64b86a/job.log
 (1/1) io/iommu/interrupt.py:VFIOInterruptTest.test_allocate_interrupts: STARTED
 (1/1) io/iommu/interrupt.py:VFIOInterruptTest.test_allocate_interrupts: PASS (51.08 s)
RESULTS    : PASS 1 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB TIME   : 56.56 s

# avocado run io/iommu/interrupt.py -p pci_device="0000:71:00.0" -p count=2048
JOB ID     : e06012082072642fe48edb4e3a295ccf7cad260f
JOB LOG    : /root/results/job-2025-09-02T06.27-e060120/job.log
 (1/1) io/iommu/interrupt.py:VFIOInterruptTest.test_allocate_interrupts: STARTED
 (1/1) io/iommu/interrupt.py:VFIOInterruptTest.test_allocate_interrupts: PASS (51.21 s)
RESULTS    : PASS 1 | ERROR 0 | FAIL 0 | SKIP 0 | WARN 0 | INTERRUPT 0 | CANCEL 0
JOB TIME   : 56.80 s