vibrator: Limit Length of Async Callback Tests

Don't wait for callbacks for long effects, as determined by a
command-line option.

Bug: 136220871
Test: VTS Tests
Change-Id: Ibaf3072a38b32b159d7b48a40860a25928c5d6f1
Merged-In: Ibaf3072a38b32b159d7b48a40860a25928c5d6f1
Signed-off-by: Harpreet \"Eli\" Sangha <eliptus@google.com>