Aaudio: Implement app shareable flag instead of -size hack

        if (retval == Result::OK) {

            hidlHandle = native_handle_create(1, 0);

            hidlHandle->data[0] = halInfo.shared_memory_fd;

            // Negative buffer size frame is a legacy hack to indicate that the buffer

            // is shareable to applications before the relevant flag was introduced

            bool applicationShareable =

                halInfo.flags & AUDIO_MMAP_APPLICATION_SHAREABLE || halInfo.buffer_size_frames < 0;

            halInfo.buffer_size_frames = abs(halInfo.buffer_size_frames);

#ifdef AUDIO_HAL_VERSION_2_0

            if (applicationShareable) {

                halInfo.buffer_size_frames *= -1;

            }

#else

            info.flags =

                halInfo.flags | (applicationShareable ? MmapBufferFlag::APPLICATION_SHAREABLE

                                                      : MmapBufferFlag::NONE);

#endif

            info.sharedMemory =

                hidl_memory("audio_buffer", hidlHandle, frameSize * halInfo.buffer_size_frames);

            info.bufferSizeFrames = halInfo.buffer_size_frames;