vfio: selftests: Introduce vfio_pci_device_test

Introduce a basic VFIO selftest called vfio_pci_device_test to
demonstrate the functionality of the VFIO selftest library and provide
some test coverage of basic VFIO operations, including:

 - Mapping and unmapping DMA
 - Mapping and unmapping BARs
 - Enabling, triggering, and disabling MSI and MSI-x
 - Reading and writing to PCI config space

This test should work with most PCI devices, as long as they are bound
to vfio-pci.

Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: David Matlack <dmatlack@google.com>
Link: https://lore.kernel.org/r/20250822212518.4156428-4-dmatlack@google.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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