[roll third_party/pigweed] pw_toolchain_bazel: Rename build file templates part 2/2

Having 1p code in a third_party directory triggers warnings pretty
easily, rename the directory to make things easier to integrate.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/183187

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 46b27ea29968182..54f1045f7e197ac
Roller-URL: https://ci.chromium.org/b/8762953539386296193
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia65f7273bce27ff8ae87837dadb71250b028c99b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/183225
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.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 46b27ea..54f1045 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 46b27ea29968182b5facbda1cf052022901bec8b
+Subproject commit 54f1045f7e197ac2aec6226dc6f391b7cf0ad37c