Rename LiveDataReactiveStreams.java to .kt

Part of the kotlin conversion process for the Lifecycle library

Test: ./gradlew bOS
Bug: 240298691
Change-Id: Ia12806bdf21ccd0f65a42cfd6ac9a75256ada60c
diff --git a/lifecycle/lifecycle-reactivestreams/src/main/java/androidx/lifecycle/LiveDataReactiveStreams.java b/lifecycle/lifecycle-reactivestreams/src/main/java/androidx/lifecycle/LiveDataReactiveStreams.kt
similarity index 100%
rename from lifecycle/lifecycle-reactivestreams/src/main/java/androidx/lifecycle/LiveDataReactiveStreams.java
rename to lifecycle/lifecycle-reactivestreams/src/main/java/androidx/lifecycle/LiveDataReactiveStreams.kt