Update rustflags to work with new hal_v4 types am: b515705780 Original change: https://android-review.googlesource.com/c/trusty/lib/+/3328499 Change-Id: I39479681c86b61bfc374bfe3dfaeda4be5f2b305 Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>