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Add a kselftest which exercises the S2MPU's MPT logic. The functions are included into a kernel module and exercised in EL1. This is because testing the EL2 driver itself would require generating DMA traffic and probing the S2MPU without crashing the system. Instead, the logic is used on a local FMPT/SMPT and the results are inspected. Test: run kvm/aarch64/s2mpu kselftest Bug: 190463801 Signed-off-by: David Brazdil <dbrazdil@google.com> Change-Id: Ib1e572e3247d864e59fad8a4960e38956237ef8c