vibrator: Update polling timeout to 50ms

Update the polling timeout to match that of main vibrator HAL.  The
polling timeout is too short, and will cause reset logic to run if the
bus is busy.

Bug: 348364432
Flag: EXEMPT bugfix
Test: atest PtsVibratorHalTestSuite \
  PtsHapticsTestCases \
  VibratorHalCs40l26TestSuite \
  VtsHalVibratorManagerTargetTest \
  VtsHalVibratorTargetTest \
  CtsVibratorTestCases
Change-Id: I31dac8f1693eda8f1a5bac8420aaa7c0d11781fa