Remove non-existing flags in AGP (#6306)

gradle.properties

@@ -1,6 +1,3 @@
-android.enableHiddenApiCheck=false
-android.hideApiWarning=false
-
 # Improve build performance by enabling R8 parallelism.
 android.r8.maxWorkers=4
 
@@ -11,7 +8,6 @@ org.gradle.jvmargs=-Xmx4g -XX:MaxMetaspaceSize=1g -Dfile.encoding=UTF-8 -XX:+Use
 org.gradle.parallel=true
 org.gradle.configuration-cache=true
 org.gradle.configuration-cache.parallel=true
-android.experimental.enableParallelR8=true
 
 # Lawnchair-TODO(Cleanup): Remove these flags once all configuration and plugins support DSL
 android.newDsl=false