[roll third_party/pigweed] pw_sys_io: Add chromiumos to alias as host system

Original-Bug: b/272090220
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/155811

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 550e61225dac26e..6e1e3db7d53834b
Roller-URL: https://ci.chromium.org/b/8775561403330607105
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I589bddbc4d995752c6aecbc82afd649326737c4c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/156030
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 550e612..6e1e3db 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 550e61225dac26e2cb70b739798cf06327d3e52e
+Subproject commit 6e1e3db7d53834bd6918742f23c07641a992eff6