Merge "Use ro.build.version.known_codenames sysprop for KNOWN_CODENAMES." am: 19c5ee8bf1 am: 247988066c am: c8d4c8faf8

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1978331

Change-Id: I1062423fe2b0c8af78e7826c123a7d547704edcd