Merge "AMRWB: Initialize rx_state passed to mime_unsorting" into rvc-dev am: 9c871c7799 am: 3114211112

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/11368147

Change-Id: I7b54f6febecedb1b336100ad8580ae23cfe5cac0