hwbcc: Add unified request struct am: 0fb8d978e7

Original change: https://android-review.googlesource.com/c/trusty/lib/+/3371720

Change-Id: Ie4c413670442a19cc8cfee7137e9e811af23fdfb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>