roll: third_party/pigweed pw_digital_io_zephyr: Guard initiator with Kconfig

Without the Kconfig this library was linked into every zephyr project
that included pigweed.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/299512
Original-Revision: 0d9eeccd9430ed3dbaa49e10b2eb28f263a552de

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 47cb4763286239..0d9eeccd9430ed
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8711668005873126721
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I312964607f65624a87f2981b665c33a2de1da1f8
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/299460
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
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 47cb476..0d9eecc 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 47cb4763286239b32d2601f91eb3221b73213527
+Subproject commit 0d9eeccd9430ed3dbaa49e10b2eb28f263a552de