[roll third_party/pigweed] pw_emu: Add Android build files

Add Android build files for pw_emu and it's Pigweed dependencies
(pw_env_setup).

Original-Bug: 316080297
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/186831

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 9ab076f1168d562..894c1ef2adf2732
Roller-URL: https://ci.chromium.org/b/8757853860585807377
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ibf3335ee3ff07011e8b5c7d8f6e28767de33d3c5
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/189303
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 9ab076f..894c1ef 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 9ab076f1168d5628e2fabe814a59f77e7d715c18
+Subproject commit 894c1ef2adf2732f9289d175342caeca8a35fe85