Increase the host_calls timing tests threshold
Increase the host_calls timing tests threshold

The enclave entry/exit in extreme cases may take more than 500ms,
increase the threshold of nanosleep/sleep/usleep/clock_gettime tests
upper limit to accomodate for that.

PiperOrigin-RevId: 265135878
Change-Id: I913d67ca655e64be9342b1008355721b64c47503

google/asylo,google/asylo,google/asylo,google/asylo,google/asylo,google/asylo