Merge "r_submix: Implement get_capture_position" am: 6ca3fb08ca am: 38e37ba4c6 am: ffabaf42ef

Original change: https://android-review.googlesource.com/c/platform/hardware/libhardware/+/1642345

Change-Id: I3abaeee2a533fbd6b4f989ae6770bd724d96e295