aaudio: update state for legacy mode

Add logging to the loopback test.
Update state in the callback.
Implement AAudioStreamRecord::getFramesWritten().

Bug: 62781173
Bug: 64214193
Test: aaudio_loopback.cpp, look for STARTED state while running
Change-Id: Iba867d048dcfcafe6db1d095abe2766f1aabe608
10 files changed