audio VTS: Update CompressedOffloadOutputStream implementation

Do not rely on blocking behavior of 'IStreamOut.write',
instead use stream callbacks. Measure the time between
write start and drain complete. This makes the test
working reliably across different chipsets.

Bug: 219767875
Test: atest VtsHalAudioV7_0TargetTest:CompressedOffloadOutputStream/CompressedOffloadOutputStreamTest
Test: atest VtsHalAudioV7_1TargetTest:CompressedOffloadOutputStream/CompressedOffloadOutputStreamTest
Change-Id: I26fd4fd26914ed2a0b3273f4ae5512a87f9cca2c
Merged-In: I26fd4fd26914ed2a0b3273f4ae5512a87f9cca2c
(cherry picked from commit a0a5d4a9)