[roll third_party/pigweed] pw_snapshot: Interpret "reason" as log

Interprets a snapshot reason as a tokenized log in case it has
additional metadata encoded in it.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/56301

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: dd646718bf1893e..60ff85ae21b5d7d
Roller-URL: https://ci.chromium.org/b/8839244762354390576
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8839244762354390576
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I7e6fc16363cf6ccef603e458d3c06ca627d3403a
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/56781
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/third_party/pigweed b/third_party/pigweed
index dd64671..60ff85a 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit dd646718bf1893e13edeffbacb23b665ed45a5e9
+Subproject commit 60ff85ae21b5d7d3afcd3a40b7dacefefb76d307