[roll third_party/pigweed] pw_thread_embos: Update thread iteration start

Updates the thread iteration to start from OS_Global.pTask, the true
full thread list starting point.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/58746

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: d7c0b9608484c73..0a58c02465f6763
Roller-URL: https://ci.chromium.org/b/8837689342993378529
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8837689342993378529
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I837fb9e2ea62bd13c677af8a7ba822532a3e9a07
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/58862
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index d7c0b96..0a58c02 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit d7c0b9608484c73ab300a9a0e4287848108a093e
+Subproject commit 0a58c02465f6763dbd319176b6aeb5606bcce699