tz: remove hwrng bench for coverage builds am: 6e9a1467fb Original change: https://android-review.googlesource.com/c/trusty/app/sample/+/3165616 Change-Id: I1add75cf645e84a80144d6a518ca03329fcb9922 Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>