[roll third_party/pigweed] third_party/freertos: Add CMake support

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/79721

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: a72272bf9e31236..826f97168b3203a
Roller-URL: https://ci.chromium.org/b/8824495562874851105
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8824495562874851105
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I3c66893e21f532b4f6acb90599d2e2eb2a1f9852
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/79981
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 a72272b..826f971 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a72272bf9e312364bd088d773dbe22a0c443068d
+Subproject commit 826f97168b3203ab0d8112293267f2111651ca19