Remove uses of std::rand() from vibrator VTS tests

Make vibrator VTS tests deterministic by removing all uses of
std::rand() from HAL input values used in test. Rely on max supported
values instead.

Fix: 324840028
Test: atest VtsHalVibratorTargetTest
Change-Id: Id40fb5a86238226feec9affff631bab37383f26b
1 file changed