iommufd/selftest: Test out_capabilities in IOMMU_GET_HW_INFO

mainline inclusion
from mainline-v6.7-rc1
commit ae36fe70cea4d7c177452ab41e6734fa3cbd4ad8
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8Y6AM
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?ae36fe70cea4d7c177452ab41e6734fa3cbd4ad8

--------------------------------

Enumerate the capabilities from the mock device and test whether it
advertises as expected. Include it as part of the iommufd_dirty_tracking
fixture.

Intel-SIG:  ae36fe70cea4 iommufd/selftest: Test out_capabilities in IOMMU_GET_HW_INFO
Backport IOMMUFD Dirty Tracking

Link: https://lore.kernel.org/r/20231024135109.73787-18-joao.m.martins@oracle.com


Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
[ jz: amend commit log ]
Signed-off-by: Jason Zeng <jason.zeng@intel.com>