Add vibrator service test mapping to source folder

Move TEST_MAPPING for FrameworksVibratorServicesTests to the
source code at services/core/java/com/android/server/vibrator.

This ensures that any changes in this source folder will also trigger
FrameworksVibratorServicesTests.

Uodate TEST_MAPPING at the test folder to import the new one, since
changes in test files should also trigger the tests.

This change also removes AndroidTest.xml, since it can use the
auto-generated one.

Test: atest --test-mapping \
       services/core/java/com/android/server/vibrator:presubmit
Bug: 290745798
Change-Id: I664f952035379000aedfa0a0339f3d0b8f2c16e0