android/hal-audio: Add proper SBC encoding

android/hal-audio: Add proper SBC encoding

Input and output stream is configured in a way that each input buffer
can be encoded to exactly one output buffer.

Reading from AudioFlinger is synchronized based on amounts of frames
which were expected to be sent since stream was resumed, i.e. as long
as we sent enough data we can wait for period of single media packet
before we need another buffer from input. Without synchronization
we'd receive next input buffer as soon as we process current one.