KVM: selftests: Verify that KVM saturates L2 TSC freq on {under,over}flow

Extend the nested TSC scaling test to validate the extreme ends of what
hardware supports, i.e. validate that KVM allows L1 to scale L2's virtual
TSC frequency up/down to the architectural maximum/minimum, from L1's
perspective, and that KVM saturates L2's effective frequency when L2's
frequency can't be virtualized by hardware (which is possible when stacking
multipliers/ratios across L1 and L2).

Link: https://patch.msgid.link/20260930173635.3362655-18-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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