Merge changes from topic...

Merge changes from topic "revert-3195812-revert-3195644-revert-3195637-revert-3184480-system_build_prop_soong-BZIDUTEOOC-KRUETCBWUR-TUHZPHUVFJ-XYILSUPUOA" into main

* changes:
  Conditionally pass kernel version to build.prop
  Revert^4 "Use Soong-built system/build.prop"
  Revert^4 "Sync gen_build_prop.py to sysprop.mk"
  Revert^4 "Add TARGET_SYSTEM_PROP to system build.prop"
  Revert^2 "Set output for build_prop even on Soong only build"