[roll pigweed] pw_function: Replace implementation with alias to fit function

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/103213

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: fad492674ccf679..85c4cfc5efd72bc
Roller-URL: https://ci.chromium.org/b/8806373727918062513
Cq-Cl-Tag: roller-builder:pigweed-zephyr-roller
Cq-Cl-Tag: roller-bid:8806373727918062513
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I9c6ce4395ca1103be228f64068a77e8b1ac2b9ef
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/105416
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 fad4926..85c4cfc 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit fad492674ccf67989fb074207b67e5f49ce9d018
+Subproject commit 85c4cfc5efd72bcb16008a8ae2014ed47ec9bfdc