aidl: suppress warnings (mixed-oneway) am: 2be7b6311f am: eefbfbd3d1 am: 7932b78a7f

Original change: https://android-review.googlesource.com/c/platform/system/gsid/+/1688327

Change-Id: I26100976d846961beee5639f5a1ea14dc0a1a853