[roll third_party/pigweed] zephyr: Add project name to unit test root

Add the missing project name to the unit tests.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/156850

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 4cb8e20663f29e6..60012df2b9051d6
Roller-URL: https://ci.chromium.org/b/8775183665918183185
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I9e187d04661a558438a7c931e4c967af51254f47
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/156721
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 4cb8e20..60012df 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 4cb8e20663f29e67574d7d33974c58b86b3baf22
+Subproject commit 60012df2b9051d69381d2e931266660b787a73ba