tools/roll-prebuilts: add mac-arm64 config

Note: the actual prebuilt URLs / sha256 will be
updated only upon the next monthly release.

Bug: 218384527
Change-Id: I7b82cff5585feb244ddef78c1803bb446daa8652
diff --git a/CHANGELOG b/CHANGELOG
index bdf8b0f..526a152 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,8 +1,10 @@
 Unreleased:
   Tracing service and probes:
+    * Added prebuilts for mac-arm64.
     * Removed merged trace and config protos from Bazel. Embedder should
       instead depend on the non-merged proto targets.
   Trace Processor:
+    * Added prebuilts for mac-arm64.
     *
   UI:
     * Added flow arrows between binder transaction pairs (request/reply