Add /dev/stdin am: 471e7f664c

Original change: https://android-review.googlesource.com/c/platform/tools/treble/+/2411185

Change-Id: Ice7c3920ab2927946c8667b4e5ad38a4c4c9c679
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>