KVM: selftests: Allow +/- 1 tolerance if expected TSC frequency is <100

Massage the nested TSC scaling test's checker to allow for validating an
expected TSC frequency of 1Hz, which is achievable for L2 since L1 can use
a completely arbitrary fractional ratio.  To do so, set the minimum
tolerance to 1, and make the thresholds inclusive, i.e. for an expected
frequency of 1, allow the actual frequency to be in the range of [0,2].
Because scaling L2's frequency down to a single Hz makes the virtual TSC
run soooo comically slow, and because all of the math is done with basic
integer arithmetic, it's very easy for the test to observe what appears to
be a frequency of 0.

Link: https://patch.msgid.link/20260930173635.3362655-13-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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