vfio: selftests: Extend mix_and_match timeout to 90s

Systems with firmware first error handling can see heavy SMM load
as a result of the mix_and_match induced IOMMU errors.  For devices
like igb that get wedged on these errors, the resulting FLR is delayed
waiting for the transaction pending register to clear, which never
occurs.  However, due to the background SMM, the backoff delays in
PCI code wildly exceed their timeouts.  As a result, the whole test
can report failure.

Extend the mix_and_match timeout to a value shown to complete reliably
on such systems, with ~2x margin.

Assisted-by: LLM
Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Alex Williamson <alex.williamson@nvidia.com>
Link: https://lore.kernel.org/r/20260911170429.1642480-4-alex.williamson@nvidia.com
Signed-off-by: Alex Williamson <alex@shazbot.org>

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