roll: third_party/pigweed 2 commits

e51b311a154e11c pw_toolchain: Use `crate_name` for GN rust targets
e194c83f1d06383 pw_toolchain: proc_macro GN cross compile

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: ddcc251bcac0c2c..e51b311a154e11c
Roller-URL: https://ci.chromium.org/b/8740826072968709073
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6b0638aaafd211d661bb9835b6213bb843481327
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/226908
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index ddcc251..e51b311 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit ddcc251bcac0c2c20dfea39bed09683851587f99
+Subproject commit e51b311a154e11ca84ff493ba279e0280c8c2df8