KVM: selftests: Create a demand paging test

While userfaultfd, KVM's demand paging implementation, is not specific
to KVM, having a benchmark for its performance will be useful for
guiding performance improvements to KVM. As a first step towards creating
a userfaultfd demand paging test, create a simple memory access test,
based on dirty_log_test.

Reviewed-by: Oliver Upton <[email protected]>
Signed-off-by: Ben Gardon <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

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