Merge "Move signing related options to a shared place" into main am: 5003ff74

Original change: https://android-review.googlesource.com/c/platform/build/+/2828703



Change-Id: I3fd7a8fae19e601886b2cb4f55adbcfd027c956d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>