Merge "kcmdlinectrl: add system property support" into main am: a781ffaac6

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2973431

Change-Id: I73eac9f1e12c2af2138198b0b3b7936ef02f1095
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>