[roll third_party/pigweed] pw_sync: Add lock traits

This CL adds trait types for C++'s lock-related named requirements:
BasicLockable, Lockable, and TimedLockable.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/153572

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: d6cad3cf1776a31..5ea607ffef8f3e6
Roller-URL: https://ci.chromium.org/b/8774948143666643121
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ib2589aea4ae1b24e691531bbcda6a5f4684e0a7f
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/157584
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 d6cad3c..5ea607f 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit d6cad3cf1776a3118f37659637785e0a83b73540
+Subproject commit 5ea607ffef8f3e6089a8dcbdbc57e4ccfa2bb930