[roll third_party/pigweed] pw_build: Remove pw_build_default_configs_in_toolchain

Removes the last remnant of the GN default config handling cleanup.

Original-Fixes: b/260111641
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/177894

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: f50e8aa47fdcf24..9aa8a037d67ac4f
Roller-URL: https://ci.chromium.org/b/8766057348632712017
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I8f7ff6922b66743c206ae6847aeaa924d57b9008
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/178112
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 f50e8aa..9aa8a03 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit f50e8aa47fdcf242373a7205af1cebff85ffaa79
+Subproject commit 9aa8a037d67ac4ff08567aa48deffa768376c624