Telescope busy level update events

they were on the hci thread, posted to the main thread, and immediately
moved to the jni thread.

go directly to the jni thread, and drop the extra ceremony & structs.

Bug: 159815595
Tag: #refactor
Test: compile & verify basic functions working
Change-Id: I20d786eca436cc8ad08c9b5620ca0b361750474e