[roll third_party/pigweed] pw_tokenizer: Proto migration stage 1.5/5

Add a CMake target, too. Should have been part of
http://pwrev.dev/191135.

Original-Bug: 322850978
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/191834

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: e4a04ae23ee51c1..d0e52407fa34561
Roller-URL: https://ci.chromium.org/b/8756183789617705777
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie0ef538bf262395a4d13d833084ceedc9b2398de
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/192190
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index e4a04ae..d0e5240 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit e4a04ae23ee51c1faaf86d87f1748978a544c665
+Subproject commit d0e52407fa34561c0f1ee8486b60a23bcbf30c4a