roll: third_party/pigweed: pw_async2: Add TimeProvider

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/232411

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: f35a192883013ad..1d56596636fd46b
Roller-URL: https://ci.chromium.org/b/8738145165063303265
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I5559ce049d1b3cf32b4239b7071eee9cb66fea0a
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/232993
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
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 f35a192..1d56596 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit f35a192883013ad9c3663c509653965c7f954c3c
+Subproject commit 1d56596636fd46bd35b3a63df34331114fea4bed