[roll third_party/pigweed] pw_bytes: Add missing export in soong rule

Test: built dependent module in Android
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/192257

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 8634c8ccc66205c..93e3ec3e23c2ad7
Roller-URL: https://ci.chromium.org/b/8756078013891257201
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ifb81171dc4c55ae874d9cd06518d59f7eb348fff
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/192555
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 8634c8c..93e3ec3 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 8634c8ccc66205c94302705fdf439a82eb0825fb
+Subproject commit 93e3ec3e23c2ad73ef5c34c1a2fe03918bd8c88f