Merge "release_config: cleanup how default values are used" into main am: e4f62e38

Original change: https://android-review.googlesource.com/c/platform/build/+/3018325



Change-Id: I245acfb4d0586c42f51684a3f314467456b550cd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>