Launch activity in vibrator status tests.

Vibrator service ignores incoming vibration from background process.
If the vibrator is running from a background process the test will fail.
Launch an activity in vibrator status tests to be considered as
foreground UID.

Bug: 139622622
Test: atest VibratorTest
Change-Id: I5b1b842e7710f54a10ba55b63be7351d1827252c
1 file changed