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Use `@DurationMillisLong` rather than `@CurrentTimeMillisLong` for the "suspended time".

Update the accessor methods for the `long suspendedTimeMs` field of `InferenceInfo` to use a duration annotation, rather than a timestamp annotation, since that field holds a duration, not an instant in time.
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Change-Id: I1d85bb1796f708dd2c3841ebc6e01e1678545a53
Bug: 392668668
Flag: EXEMPT bugfix