Configure and read back bluetooth_multiplex_socket am: 989ee52176 am: ff557518e6 am: e940b9911d am: 7d5f7568c2 am: 21faa5fa15

Original change: https://android-review.googlesource.com/c/platform/platform_testing/+/2751719

Change-Id: I73f1b9921ebf227403618bd0d31396c60a7715eb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>