[roll third_party/pigweed] pw_proto: Create genrule for raw rpc with prefix

Original-Bug: 340749161
Test: Code on android main uses it and can build.
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/209992
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 843bd1cf3b198a4..6393be463cc0815
Roller-URL: https://ci.chromium.org/b/8747793978418330049
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ib66fe99f36d942ba567eb4ba3aa5c3403afe20cc
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/210135
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 843bd1c..6393be4 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 843bd1cf3b198a4e3749e1bdf16726418f11da1b
+Subproject commit 6393be463cc08150c06b982b388cfb6481533646