roll: third_party/pigweed pw_rpc: Enable echo_service_test in Bazel

Enable //pw_rpc/nanopb:echo_service_test in Bazel, since Nanopb options
files are supported.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/247193
Original-Revision: 43f914dd2bf92f1417dde6439d0cd1f942934e9f

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: efc9bf61a76323..43f914dd2bf92f
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8731783129060728433
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie850fa1d4b8efea196c25311d583f6f5d8eb0bd2
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/247530
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index efc9bf6..43f914d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit efc9bf61a76323c587e04bf557da25af7937fa68
+Subproject commit 43f914dd2bf92f1417dde6439d0cd1f942934e9f