[rialto] Refactor process_request API return type am: 83c974d3d2 am: 6c194eb25f

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/2775148

Change-Id: I32fe0f029c00d531f363c3c546b1aab93db6c235
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>