Revert^3 "Sync gen_build_prop.py to sysprop.mk" am: c13856eb

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3195812



Change-Id: Ib29b211c5a0a25d14cfd0b8a5badf75393261b3c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>