Merge "[sf] Add readme for surfaceflinger frontend" into udc-dev am: 0f0d7b0309

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/23272393

Change-Id: I26c16023aba7d0b7d66cb1bd04c6d91a3b8f9bac
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>