pw_rpc: Export pw_toolchain from pw_rpc_defaults

Change-Id: I22d3a8eb1c9266ca9c4aafead7a4b8d3a41a357b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/132450
Pigweed-Auto-Submit: Victor Berchet <berchet@google.com>
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/pw_rpc/Android.bp b/pw_rpc/Android.bp
index ca760d0..9abba4d 100644
--- a/pw_rpc/Android.bp
+++ b/pw_rpc/Android.bp
@@ -139,6 +139,7 @@
         "pw_span_headers",
         "pw_sync_baremetal_headers",
         "pw_sync_headers",
+        "pw_toolchain",
     ],
     static_libs: [
         "pw_bytes",