skpbench: always reboot instead of unlocking clocks

Bug: skia:
Change-Id: I2589c672823f1da8ea136e90fa083431b4f2e3b2
Reviewed-on: https://skia-review.googlesource.com/62945
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
5 files changed