Clean up after upstreaming platform branch

Sets targetSdkVersion to 29 because there is additional work required to
set it to 30. We'll deal with that later...

Bug: 157027847
Test: ./gradlew bOS
Change-Id: Ib5acccb48c7d9c782f3ce2ada0cd818a42093b57
diff --git a/gradle.properties b/gradle.properties
index 120d97c..80ef0f4 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -12,4 +12,4 @@
 kotlin.parallel.tasks.in.project=true
 # Workaround for b/141364941
 android.forceJacocoOutOfProcess=true
-androidx.writeVersionedApiFiles=false
+androidx.writeVersionedApiFiles=true