Support multiple transmit buffer allocation am: a52885c99f

Original change: https://android-review.googlesource.com/c/platform/hardware/google/apf/+/3351220

Change-Id: If183a2c713092061cc2fee48f9b447d495b2ea1d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>