[roll third_party/pigweed] pw_digital_io_linux: Add Android.bp

Also add a pw_digital_io static lib.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/194432

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: c29c6a0f7bc8c58..94b1e27729f2b64
Roller-URL: https://ci.chromium.org/b/8753368172192983681
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I5e419e5417b0ab59629d4faf0cfc8fe6fad42f13
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/197151
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 c29c6a0..94b1e27 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit c29c6a0f7bc8c584626fa22aa1826bb8e1b2e42c
+Subproject commit 94b1e27729f2b64e5a86dfd9e68b5e635e6effba