ci/baremetal: Fix more freedreno infrastructure flakiness

Emma Anholt requested to merge anholt/mesa:ci-a530-instaboots into master
  • Hopefully fix !POWER_GOOD detection, regressed from "fails job fast" to "timeouts" during the "make !POWER_GOOD restart the job" series. Oops.
  • Hopefully detect spontaneous reboots in a530 and restart the job.
  • Add timestamps to bare-metal serial output for when you're wondering where all your time went.

Unfortunately, these errors are infrequent enough (or clustered enough in time?) that it's hard to reproduce them to make sure I've really fixed things.

Hopefully this fixes the last of the freedreno issues in #3437

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