Remove VibrationEffect javadocs to methods not available in public APIs.

Change already landed in aosp/2214741. Need to land this fix in tm-dev for it to show up in the published reference docs.

Change-Id: Idf5a339a5fb0ffd510e7fda0e3784916c8505eae
Merged-In: Idf5a339a5fb0ffd510e7fda0e3784916c8505eae
Bug: 245491186
Test: N/A