Add unit test with high-res timer for DeviceSyncer

[BKP]

The unit test has fixture executions for MI210 hardware. On other GCN architectures, tests may stall out in the polling loop with the DeviceSyncer due to block not being scheduled on SM.

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[chhwang]

@BKP Thank you for contribution! Could you advise me where these numbers are from? 25MHz looks too small as GPU clock frequency.

[BKP]

The frequency comes from a constant frequency timer.

Information from the instruction can be found in the ISA manual for either MI100 or MI200. (The "27" for GFX900 is not well documented as far as I know, but the "25" from the newer architectures is clearly specified in newer ISA manuals.)

https://gpuopen.com/amd-isa-documentation/

https://www.amd.com/content/dam/amd/en/documents/instinct-tech-docs/instruction-set-architectures/instinct-mi200-cdna2-instruction-set-architecture.pdf

See "s_memrealtime".