[roll third_party/pigweed] third_party/freertos: CM4F port build targets

Adds build targets for the ARM GCC Cortex-M4F FreeRTOS port.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/72960

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 21eebff92db17c4..4a5c13cd9cb233b
Roller-URL: https://ci.chromium.org/b/8828304608080679553
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8828304608080679553
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Iad88eb213bbdd53db5a992e7d9f1b48755522514
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/73080
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 21eebff..4a5c13c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 21eebff92db17c470a337f9ec9fbb96eb17eafef
+Subproject commit 4a5c13cd9cb233b480a77f356f906008e7834e34