Avoid waiting for the async notifyAnrDelayStarted

The binder interface is already one-way, but previously, we were
blocking for x seconds for a result.

Now, notifyAnrDelayStarted is purely async without any blocking. It is
also a best effort request because we don't attempt to connect if the
service is unavailable.

Test: Manual
Bug: 170486601
Change-Id: I2a817d71970c0c03fe0e3e3d3a4871396f887c93