[roll pigweed] pw_thread_freertos: Thread iteration API implementation

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/105161

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: fe1681d9ab676ec..d055225b7dda9f4
Roller-URL: https://ci.chromium.org/b/8805351407273581105
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I27f9b5d781ffd0faca632056474ad9a2201a9704
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/107685
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/pigweed b/pigweed
index fe1681d..d055225 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit fe1681d9ab676ec2b1ada6404030c9d7fa100185
+Subproject commit d055225b7dda9f4a80484f5c440e253fff16b0e7