Fix timeouts from libvibratorservice_benchmarks

Setup binder process thread pool for vibrator HAL benchmark tests to fix
binder transaction errors of the type:

E Vibrator: Failed completion callback: -129

This change also adds checks for HAL results, which will cause them to
fail earlier with a useful error message when the device reaches a bad
state. This should avoid timeout failures for the whole test suite.

Other fixes:

- Fix vibrator.on(ms) tests to use a max duration value
- Use a smaller fixed # of iterations on tests that iterate on vibrate
  calls, and add wait for vibration to be complete to measure the HAL
  in a more stable state;

Bug: 329175148
Test: atest libvibratorservice_benchmarks
Change-Id: I93a39604b661152ebd60cee38bfc7ccd9ff832b6