[third_party/pigweed] Roll 3 commits

dc5c87c532e5c75 pw_system: Simplify pw_system usage in Bazel
eeec5566194948d targets/rp2040: Refresh target docs
905d4268e336ff1 pw_clock_tree: Generic clock tree management

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: de0813bee2778fe..dc5c87c532e5c75
Roller-URL: https://ci.chromium.org/b/8747374806275182577
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie506611d7d99892255e3341d860a20286c9dd0fb
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/210529
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index de0813b..dc5c87c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit de0813bee2778fe28f61a0ec3ff22ae2e44599dc
+Subproject commit dc5c87c532e5c75938c4d9b99bffbae67d7172be